Pop-Up and Inline Edit Forms in Blazor Grid

• Aug 24, 2026
• 21 minutes to read

In EditForm or PopupEditForm mode, the Grid displays an inline or pop-up edit form instead of the edited data row. Users can click command buttons to create, modify, and delete grid rows.

Run Demo: Edit Forms

Video Tutorial

Enable Editing

The built-in edit form shows only the predefined Save and Cancel buttons. Use the EditFormTemplate to populate the edit form with editors. Call the GetEditor(String) method to add an automatically generated column editor in the edit form.

Note

When you place a templated component in the edit form template, a Razor error may occur. To prevent this error, specify the Context parameter explicitly for either the Grid template or the nested component.

To enable data editing, you must:

1. Use the EditFormTemplate to populate the edit form with editors.

2. Declare a DxGridCommandColumn object in the Columns template to display the command column.

3. If your data object has a primary key, assign it to the KeyFieldName or KeyFieldNames property.

4. Handle EditModelSaving and DataItemDeleting events to save changes and reload Grid data.

5. (Optional) Set the EditMode property to PopupEditForm to display the edit form in a pop-up window.

6. (Optional) Use the EditNewRowPosition property to display the new item row or change the position of the inline edit form displayed for new records.

When users start editing a row, the Grid creates a clone of the edited data item, called an edit model. During edit operations, the Grid applies user changes only to the edit model and keeps the data item unchanged until the EditModelSaving or DataItemDeleting event fires. Refer to the following topic for additional information: Edit Model in Blazor Grid.

The following code sample allows users to edit Grid data in the inline edit form:

Razor

@using Microsoft.EntityFrameworkCore
@inject IDbContextFactory<NorthwindContext> NorthwindContextFactory
@implements IDisposable

<DxGrid Data="Data"
        EditModelSaving="OnEditModelSaving"
        DataItemDeleting="OnDataItemDeleting"
        CustomizeEditModel="OnCustomizeEditModel"
        KeyFieldName="EmployeeId">
    <Columns>
        <DxGridCommandColumn />
        <DxGridDataColumn FieldName="FirstName" />
        <DxGridDataColumn FieldName="LastName" />
        <DxGridDataColumn FieldName="Title" />
        <DxGridDataColumn FieldName="HireDate" />
    </Columns>
    <EditFormTemplate Context="editFormContext">
        <DxFormLayout>
            <DxFormLayoutItem Caption="First Name:">
                @editFormContext.GetEditor("FirstName")
            </DxFormLayoutItem>
            <DxFormLayoutItem Caption="Last Name:">
                @editFormContext.GetEditor("LastName")
            </DxFormLayoutItem>
            <DxFormLayoutItem Caption="Title:">
                @editFormContext.GetEditor("Title")
            </DxFormLayoutItem>
            <DxFormLayoutItem Caption="Hire Date:">
                @editFormContext.GetEditor("HireDate")
            </DxFormLayoutItem>
        </DxFormLayout>
    </EditFormTemplate>
</DxGrid>

@code {
    IEnumerable<Employee> Data { get; set; }
    NorthwindContext Northwind { get; set; }

    protected override async Task OnInitializedAsync() {
        Northwind = NorthwindContextFactory.CreateDbContext();
        Data = await Northwind.Employees.ToListAsync();
    }

    void OnCustomizeEditModel(GridCustomizeEditModelEventArgs e) {
        if(e.IsNew) {
            var editModel = (Employee)e.EditModel;
            editModel.EmployeeId = Data.Max(x => x.EmployeeId) + 1;
        }
    }

    async Task OnEditModelSaving(GridEditModelSavingEventArgs e) {
        var editModel = (Employee)e.EditModel;
        if (e.IsNew)
            await Northwind.AddAsync(editModel);
        else
            e.CopyChangesToDataItem();
        // Post changes to the database.
        await Northwind.SaveChangesAsync();
        // Reload the entire Grid.
        Data = await Northwind.Employees.ToListAsync();
    }

    async Task OnDataItemDeleting(GridDataItemDeletingEventArgs e) {
        // Remove the data item from the database.
        Northwind.Remove(e.DataItem);
        await Northwind.SaveChangesAsync();
        // Reload the entire Grid.
        Data = await Northwind.Employees.ToListAsync();
    }

    public void Dispose() {
        Northwind?.Dispose();
    }
}

Employee

using System;
using System.Collections.Generic;
using System.ComponentModel.DataAnnotations;

namespace Grid.Northwind {
    public partial class Employee {
        public int EmployeeId { get; set; }
        [Required]
        public string LastName { get; set; }
        [Required]
        public string FirstName { get; set; }
        [Required]
        public string Title { get; set; }
        public string TitleOfCourtesy { get; set; }
        public Nullable<System.DateTime> BirthDate { get; set; }
        [Required]
        [Range(typeof(DateTime), "1/1/2000", "1/1/2020",
        ErrorMessage = "HireDate must be between {1:d} and {2:d}")]
        public Nullable<System.DateTime> HireDate { get; set; }
        public string Address { get; set; }
        public string City { get; set; }
        public string Region { get; set; }
        public string PostalCode { get; set; }
        public string Country { get; set; }
        public string HomePhone { get; set; }
        public string Extension { get; set; }
        public byte[] Photo { get; set; }
        public string Notes { get; set; }
        public Nullable<int> ReportsTo { get; set; }
        public string PhotoPath { get; set; }
        public virtual ICollection<Order> Orders { get; set; }
        public string Text => $"{FirstName} {LastName} ({Title})";
        public string ImageFileName => $"Employees/{EmployeeId}.jpg";
    }
}

NorthwindContext

using Microsoft.EntityFrameworkCore;
#nullable disable

namespace Grid.Northwind {
    public partial class NorthwindContext : DbContext {

        public NorthwindContext(DbContextOptions<NorthwindContext> options)
            : base(options) {
        }
        // ...
        public virtual DbSet<Employee> Employees { get; set; }

        protected override void OnConfiguring(DbContextOptionsBuilder optionsBuilder) {
            if(!optionsBuilder.IsConfigured) {
                optionsBuilder.UseSqlServer("Server=.\\sqlexpress;Database=Northwind;Integrated Security=true");
            }
        }

        protected override void OnModelCreating(ModelBuilder modelBuilder) {
            modelBuilder.HasAnnotation("Relational:Collation", "SQL_Latin1_General_CP1_CI_AS");
            // ...
            modelBuilder.Entity<Employee>(entity => {
                entity.HasIndex(e => e.EmployeeId, "EmployeeId");
                entity.HasIndex(e => e.LastName, "LastName");
                entity.HasIndex(e => e.FirstName, "FirstName");
                entity.HasIndex(e => e.Title, "Title");
                entity.HasIndex(e => e.BirthDate, "BirthDate");
                entity.HasIndex(e => e.HireDate, "HireDate");
                entity.HasIndex(e => e.Notes, "Notes");
            });
            OnModelCreatingPartial(modelBuilder);
        }

        partial void OnModelCreatingPartial(ModelBuilder modelBuilder);
    }
}

Program.cs

using Microsoft.EntityFrameworkCore;
// ...
builder.Services.AddDbContextFactory<NorthwindContext>((sp, options) => {
    var env = sp.GetRequiredService<IWebHostEnvironment>();
    var dbPath = Path.Combine(env.ContentRootPath, "Northwind-5e44b51f.mdf");
    options.UseSqlServer("Server=(localdb)\\MSSQLLocalDB;Integrated Security=true;AttachDbFileName=" + dbPath);
});

Related API

This section contains a comprehensive editing-related API reference.

Show API Reference

DxGrid API member	Type	Description
CustomValidators	Property	Allows you to declare custom validator components.
EditFormButtonsVisible	Property	Specifies whether the edit form contains the predefined Save and Cancel buttons.
EditFormTemplate	Property	Specifies the template used to display the edit form.
EditMode	Property	Specifies how users edit Grid data.
EditNewRowPosition	Property	Specifies the position of UI elements used to create new rows.
PopupEditFormCssClass	Property	Assigns a CSS class to the pop-up edit form.
PopupEditFormHeaderText	Property	Specifies text displayed in the pop-up edit form’s header.
ValidationEnabled	Property	Specifies whether the Grid validates user input in DevExpress data editors located in the edit form or edit cells.
CancelEditAsync()	Method	Cancels row editing and discards changes.
GetColumnEditSettings<T>(String)	Method	Returns editor settings of the column bound to the specified data source field.
GetEditContext()	Method	Returns the edit context.
IsEditing()	Method	Returns whether the Grid is being edited.
IsEditingNewRow()	Method	Returns whether a new Grid row is being edited.
IsEditingRow(Int32)	Method	Returns whether the specified Grid row is being edited.
SaveChangesAsync()	Method	Triggers validation and raises the EditModelSaving event if validation succeeds. The method immediately raises this event if validation is disabled.
ShowDataItemDeleteConfirmation(Object)	Method	Displays the delete confirmation dialog for the specified data item. If a user confirms the operation, the method raises the DataItemDeleting event.
ShowRowDeleteConfirmation(Int32)	Method	Displays the delete confirmation dialog for the specified row. If a user confirms the operation, the method raises the DataItemDeleting event.
StartEditDataItemAsync(Object, String)	Method	Starts editing the specified data item.
StartEditNewRowAsync(String)	Method	Starts editing a new row.
StartEditRowAsync(Int32, String)	Method	Starts editing the row with the specified visible index.
CustomizeDataRowEditor	Event	Allows you to customize a cell editor in a data row.
CustomizeEditModel	Event	Allows you to create a custom edit model or customize an automatically generated edit model.
DataItemDeleting	Event	Fires when a user confirms the delete operation in the delete confirmation dialog.
EditCanceling	Event	Fires before the Grid cancels the edit operation and discards changes.
EditModelSaving	Event	Fires if validation succeeds after a user saves changes or you call the SaveChangesAsync() method.
EditStart	Event	Fires before the Grid starts editing a row.

DxGridCommandColumn API member	Type	Description
CellDisplayTemplate	Property	Specifies a template used to display command column cells.
DeleteButtonVisible	Property	Specifies whether the command column displays Delete buttons.
DisplayMode	Property	Specifies whether command buttons display icons, captions, or both.
EditButtonVisible	Property	Specifies whether the command column displays Edit buttons.
HeaderTemplate	Property	Specifies a template used to display the command column header.
NewButtonVisible	Property	Specifies whether the command column displays the New button.

DxGridDataColumn API member	Type	Description
DataRowEditorVisible	Property	Specifies whether to render the editor associated with this column in the column edit cell, edit form, or pop-up edit form.
EditSettings	Property	Allows you to customize the editor associated with this column.
ReadOnly	Property	Specifies whether a user can change the column editor value when the Grid is in edit mode.

Task-Based Examples

This section includes code samples that demonstrate form-editing functionality.

Customize Pop-Up Edit Form

You can set the EditMode property to PopupEditForm to display the edit form in a pop-up window. Specify the PopupEditFormCssClass property to apply a CSS class to the pop-up edit form. Use the PopupEditFormHeaderText property to change the text in the edit form header.

The following code snippet changes the pop-up edit form’s size and header text:

Razor

<DxGrid Data="Data"
        EditModelSaving="OnEditModelSaving"
        DataItemDeleting="OnDataItemDeleting"
        KeyFieldName="EmployeeId"
        EditMode="GridEditMode.PopupEditForm"
        PopupEditFormHeaderText="Edit Employee"
        PopupEditFormCssClass="my-style">
    <Columns>
        <DxGridCommandColumn />
        <DxGridDataColumn FieldName="FirstName" />
        <DxGridDataColumn FieldName="LastName" />
        <DxGridDataColumn FieldName="Title" />
        <DxGridDataColumn FieldName="HireDate" />
    </Columns>
    <EditFormTemplate Context="editFormContext">
        <DxFormLayout>
            <DxFormLayoutItem Caption="First Name:">
                @editFormContext.GetEditor("FirstName")
            </DxFormLayoutItem>
            <DxFormLayoutItem Caption="Last Name:">
                @editFormContext.GetEditor("LastName")
            </DxFormLayoutItem>
            <DxFormLayoutItem Caption="Title:">
                @editFormContext.GetEditor("Title")
            </DxFormLayoutItem>
            <DxFormLayoutItem Caption="Hire Date:">
                @editFormContext.GetEditor("HireDate")
            </DxFormLayoutItem>
        </DxFormLayout>
    </EditFormTemplate>
</DxGrid>

CSS

.my-style {
    min-width: 800px;
}

Hide Predefined Edit Form Buttons

Disable the EditFormButtonsVisible option to hide the predefined Save and Cancel buttons. Instead of them, you can implement your own buttons. Note the following specifics:

• Instead of the Save button, you can use a submit button or a button that calls the SaveChangesAsync method on click.

• To discard changes and hide the edit form, call the CancelEditAsync method in a custom button’s click event handler.

The following example displays custom Save and Cancel buttons in the edit form:

<DxGrid Data="Data"
        EditModelSaving="OnEditModelSaving"
        DataItemDeleting="OnDataItemDeleting"
        KeyFieldName="EmployeeId"
        EditFormButtonsVisible="false">
    <Columns>
        <DxGridCommandColumn />
        <DxGridDataColumn FieldName="FirstName" />
        <DxGridDataColumn FieldName="LastName" />
        <DxGridDataColumn FieldName="Title" />
        <DxGridDataColumn FieldName="HireDate" />
    </Columns>
    <EditFormTemplate Context="editFormContext">
        <DxFormLayout>
            <DxFormLayoutItem Caption="First Name:">
                @editFormContext.GetEditor("FirstName")
            </DxFormLayoutItem>
            <DxFormLayoutItem Caption="Last Name:">
                @editFormContext.GetEditor("LastName")
            </DxFormLayoutItem>
            <DxFormLayoutItem Caption="Title:">
                @editFormContext.GetEditor("Title")
            </DxFormLayoutItem>
            <DxFormLayoutItem Caption="Hire Date:">
                @editFormContext.GetEditor("HireDate")
            </DxFormLayoutItem>
            <DxFormLayoutItem ColSpanMd="12">
                <DxButton SubmitFormOnClick="true" Text="Save" />
                <DxButton Click="@(() => MyGrid.CancelEditAsync())" Text="Cancel" />
            </DxFormLayoutItem>
        </DxFormLayout>
    </EditFormTemplate>
</DxGrid>

View Example: Use an External Popup as an Edit Form

Conditionally Disable Row Editing

To prevent users from editing specific records, create a custom Edit button and disable it for the corresponding rows. The following example prevents users from editing records dated today or earlier:

@inject WeatherForecastService ForecastService

<DxGrid @ref="myGrid" Data="@forecasts" EditModelSaving="OnEditModelSaving">
    <Columns>
        <DxGridCommandColumn NewButtonVisible=false>
            <CellDisplayTemplate>
                @{
                    var date = context.DataItem != null ? (context.DataItem as WeatherForecast).Date : DateTime.Now;
                    <DxButton Text="Edit"
                              RenderStyle="ButtonRenderStyle.Link"
                              Click="() => myGrid.StartEditDataItemAsync(context.DataItem)"
                              Enabled="@(date >= DateTime.Now)" />
                }
            </CellDisplayTemplate>
        </DxGridCommandColumn>
        <DxGridDataColumn Caption="Date" FieldName="Date"/>
        <DxGridDataColumn Caption="Summary" FieldName="Summary"/>
        <DxGridDataColumn Caption="Temperature (C)" FieldName="TemperatureC"/>
        <DxGridDataColumn Caption="Temperature (F)" FieldName="TemperatureF"/>
    </Columns>
    <EditFormTemplate Context="editFormContext">
        <DxFormLayout>
            <DxFormLayoutItem Caption="Date:">
                @editFormContext.GetEditor("Date")
            </DxFormLayoutItem>
            <DxFormLayoutItem Caption="Summary:">
                @editFormContext.GetEditor("Summary")
            </DxFormLayoutItem>
            <DxFormLayoutItem Caption="Temperature (C):">
                @editFormContext.GetEditor("TemperatureC")
            </DxFormLayoutItem>
            <DxFormLayoutItem Caption="Temperature (F):">
                @editFormContext.GetEditor("TemperatureF")
            </DxFormLayoutItem>
        </DxFormLayout>
    </EditFormTemplate>
</DxGrid>

@code {
    List<WeatherForecast>? forecasts;
    IGrid myGrid { get; set; }

    protected override async Task OnInitializedAsync() {
        forecasts = await ForecastService.GetForecastAsync(DateTime.Now.AddDays(-2));
    }

    void OnEditModelSaving(GridEditModelSavingEventArgs e) {
        e.CopyChangesToDataItem();
    }
}

View Example: Disable Row Editing Depending on Row Values

Use Different Edit Modes for Add and Edit Operations

The following code snippet displays a pop-up edit form for new rows. Users can edit individual cells in existing rows directly with in-place editors:

Razor

@inject DataService DataService

<DxGrid @ref="Grid"
        Data="@products"
        EditMode="@editMode"
        DataItemDeleting="OnDataItemDeleting"
        EditStart="OnEditStart"
        EditCanceling="OnEditCanceling"
        EditModelSaving="OnEditModelSaving">
    <Columns>
        <DxGridCommandColumn EditButtonVisible="false"
                             CancelButtonVisible="false"
                             SaveButtonVisible="false" />
        <DxGridDataColumn FieldName="ProductName" />
        <DxGridDataColumn FieldName="QuantityPerUnit" />
        <DxGridDataColumn FieldName="UnitPrice" DisplayFormat="c2" />
        <DxGridDataColumn FieldName="Discontinued" />
    </Columns>
    <EditFormTemplate Context="editFormContext">
        <DxFormLayout>
            <DxFormLayoutItem Caption="Product Name:" ColSpanMd="6">
                @editFormContext.GetEditor("ProductName")
            </DxFormLayoutItem>
            <DxFormLayoutItem Caption="Quantity per Unit:" ColSpanMd="6">
                @editFormContext.GetEditor("QuantityPerUnit")
            </DxFormLayoutItem>
            <DxFormLayoutItem Caption="Unit Price:" ColSpanMd="6">
                @editFormContext.GetEditor("UnitPrice")
            </DxFormLayoutItem>
            <DxFormLayoutItem Caption="Discontinued:" ColSpanMd="6">
                @editFormContext.GetEditor("Discontinued")
            </DxFormLayoutItem>
        </DxFormLayout>
    </EditFormTemplate>
</DxGrid>

@code {
    IGrid Grid { get; set; }
    private GridEditMode editMode = GridEditMode.EditCell;
    private List<Product> products = new();
    private List<Category> categories = new();

    protected override void OnInitialized() {
        products = DataService.GetProducts().ToList();
        categories = DataService.GetCategories().ToList();
    }

    void OnDataItemDeleting(GridDataItemDeletingEventArgs e) {
        if (e.DataItem is Product product)
            products.Remove(product);
    }

    void OnEditStart(GridEditStartEventArgs e) {
        SetEditMode(e.IsNew ? GridEditMode.PopupEditForm : GridEditMode.EditCell);
    }

    void OnEditCanceling(GridEditCancelingEventArgs e) {
        SetEditMode(GridEditMode.EditCell);
    }

    void OnEditModelSaving(GridEditModelSavingEventArgs e) {
        var editModel = (Product)e.EditModel;
        if (e.IsNew)
            products.Add(editModel);
        else
            e.CopyChangesToDataItem();

        SetEditMode(GridEditMode.EditCell);
    }

    void SetEditMode(GridEditMode mode) {
        if (editMode == mode) return;
        Grid.BeginUpdate();
        editMode = mode;
        Grid.EndUpdate();
    }
}

Model.cs

using System.Collections.ObjectModel;

public class Category {
    public int CategoryID { get; set; }
    public string CategoryName { get; set; } = string.Empty;
    public string? Description { get; set; }
}

public class Customer(int id, string? firstName, string? lastName, string? country, string? city, string? address, string? phone, string? postalCode) {
    public Customer() : this(-1, null, null, null, null, null, null, null) {
    }
    public int Id { get; set; } = id;
    public string? FirstName { get; set; } = firstName;
    public string? LastName { get; set; } = lastName;
    public string? Country { get; set; } = country;
    public string? City { get; set; } = city;
    public string? Address { get; set; } = address;
    public string? Phone { get; set; } = phone;
    public string? PostalCode { get; set; } = postalCode;
    public virtual ObservableCollection<Order> Orders { get; set; } = new ObservableCollection<Order>();

    public string FullName {
        get => $"{FirstName} {LastName}";
    }
    public override string ToString() => FullName;
}

public enum OrderState {
    Draft,
    Shipping,
    Paid,
    Processed
}

public class Order {
    public int Id { get; set; }
    public virtual Customer? Customer { get; set; }
    public DateTime OrderDate { get; set; }
    public virtual ObservableCollection<OrderItem> Items { get; set; } = new();

    public int ItemsCount { get => Items.Count; }
    public decimal TotalAmount { get => Items.Sum(d => d.Amount); }
}

public class OrderItem {
    public int Id { get; set; }
    public int Quantity { get; set; }
    public virtual Order? Order { get; set; }
    public virtual Product? Product { get; set; }
    public decimal Amount {
        get { return (Product != null) ? (Quantity * Product.UnitPrice) : 0; }
    }
}

public class Product() {
    public int ProductID { get; set; }
    public string ProductName { get; set; } = string.Empty;
    public int? SupplierID { get; set; }
    public int? CategoryID { get; set; }
    public string? QuantityPerUnit { get; set; }
    public decimal UnitPrice { get; set; }
    public short? UnitsInStock { get; set; }
    public short? UnitsOnOrder { get; set; }
    public short? ReorderLevel { get; set; }
    public bool Discontinued { get; set; }
    public DateTime? RestockDate { get; set; }
}

DataService.cs

using System.Collections.ObjectModel;

public class DataService {
    List<Customer> customers = [
        new(1, "John", "Doe", "USA", "Homesville", "123 Home Lane", "[phone]", "55555"),
        new(2, "Sam", "Hill", "Germany", "Berlin", "Friedrichstraße 123", "[phone]", "10117"),
        new(3, "Karen", "Holmes", "USA", "Hillsville", "45 Hill St.", "[phone]", "44444"),
        new(4, "Bobbie", "Valentine", "Germany", "Munich", "Maximilianstraße 45", "[phone]", "80539"),
        new(5, "Jennie", "Fuller", "Germany", "Hamburg", "Reeperbahn 89", "[phone]", "20359"),
        new(6, "Albert", "Menendez", "USA", "Chicago", "933 Heart St. Suite", "[phone]", "9900"),
        new(7, "Frank", "Frankson", "France", "Paris", "25 Rue de Rivoli", "[phone]", "75004"),
        new(8, "Christa", "Christie", "UK", "London", "221B Baker Street", "[phone]", "NW1 6XE"),
        new(9, "Jimmie", "Jones", "USA", "Newman", "900 Newman Center.", "[phone]", "89123"),
        new(10, "Alfred", "Newman", "Germany", "Frankfurt", "Goethestraße 10", "[phone]", "60313"),
        new(11, "Benjamin", "Johnson", "UK", "Manchester", "50 Deansgate", "[phone]", "M3 2BW"),
        new(12, "Alex", "James", "USA", "Los Angeles", "349 Graphic Design L", "[phone]", "12211"),
        new(13, "Beau", "Alessandro", "UK", "Birmingham", "30 New Street", "[phone]", "B2 4ND"),
        new(14, "Bruce", "Campbell", "USA", "San Francisco", "350 Market Street", "[phone]", "94103"),
        new(15, "Cindy", "Haneline", "USA", "Houston", "600 Main Street", "[phone]", "77002"),
        new(16, "Andrea", "Deville", "France", "Bordeaux", "14 Cours de l'Intendance", "[phone]", "33000"),
        new(17, "Anita", "Ryan", "UK", "Cardiff", "30 Castle Street", "[phone]", "CF10 1BT"),
        new(18, "George", "Bunkelman", "UK", "Liverpool", "100 Albert Dock", "[phone]", "L3 4AA"),
        new(19, "Anita", "Cardle", "USA", "Seattle", "1200 Pine Street", "[phone]", "98101"),
        new(20, "Andrew", "Carter", "Germany", "Stuttgart", "Königstraße 20", "[phone]", "70173"),
        new(21, "Almas", "Bunch", "USA", "Boston", "75 Beacon Street", "[phone]", "02108"),
        new(22, "Abigail", "Hazel", "UK", "Glasgow", "75 Buchanan Street", "[phone]", "G1 3HL"),
        new(23, "Anthony", "Vicars", "Germany", "Düsseldorf", "Königsallee 85", "[phone]", "40212"),
        new(24, "Dora", "Geeter", "UK", "Bristol", "20 Queen Square", "[phone]", "BS1 4ND"),
        new(25, "Anthony", "Boyd", "USA", "Denver", "1500 Blake Street", "[phone]", "80202"),
        new(26, "Dora", "Catto", "USA", "Atlanta", "200 Peachtree Street", "[phone]", "30303"),
    ];
    static DateTime restockDate = DateTime.Today.AddMonths(1);
    List<Product> products = [
        new Product { ProductID = 1, ProductName = "Chai", SupplierID = 1, CategoryID = 1, QuantityPerUnit = "10 boxes x 20 bags", UnitPrice = 18.00m, UnitsInStock = 39, UnitsOnOrder = 0, ReorderLevel = 10, Discontinued = false },
        new Product { ProductID = 2, ProductName = "Chang", SupplierID = 1, CategoryID = 1, QuantityPerUnit = "24 - 12 oz bottles", UnitPrice = 19.00m, UnitsInStock = 17, UnitsOnOrder = 40, ReorderLevel = 25, Discontinued = false, RestockDate = restockDate },
        new Product { ProductID = 3, ProductName = "Aniseed Syrup", SupplierID = 1, CategoryID = 2, QuantityPerUnit = "12 - 550 ml bottles", UnitPrice = 10.00m, UnitsInStock = 13, UnitsOnOrder = 70, ReorderLevel = 25, Discontinued = false, RestockDate = restockDate },
        new Product { ProductID = 4, ProductName = "Chef Anton's Cajun Seasoning", SupplierID = 2, CategoryID = 2, QuantityPerUnit = "48 - 6 oz jars", UnitPrice = 22.00m, UnitsInStock = 53, UnitsOnOrder = 0, ReorderLevel = 0, Discontinued = false },
        new Product { ProductID = 5, ProductName = "Chef Anton's Gumbo Mix", SupplierID = 2, CategoryID = 2, QuantityPerUnit = "36 boxes", UnitPrice = 21.35m, UnitsInStock = 0, UnitsOnOrder = 0, ReorderLevel = 0, Discontinued = true },
        new Product { ProductID = 6, ProductName = "Grandma's Boysenberry Spread", SupplierID = 3, CategoryID = 2, QuantityPerUnit = "12 - 8 oz jars", UnitPrice = 25.00m, UnitsInStock = 120, UnitsOnOrder = 0, ReorderLevel = 25, Discontinued = false },
        new Product { ProductID = 7, ProductName = "Uncle Bob's Organic Dried Pears", SupplierID = 3, CategoryID = 7, QuantityPerUnit = "12 - 1 lb pkgs.", UnitPrice = 30.00m, UnitsInStock = 15, UnitsOnOrder = 0, ReorderLevel = 10, Discontinued = false, RestockDate = restockDate },
        new Product { ProductID = 8, ProductName = "Northwoods Cranberry Sauce", SupplierID = 3, CategoryID = 2, QuantityPerUnit = "12 - 12 oz jars", UnitPrice = 40.00m, UnitsInStock = 6, UnitsOnOrder = 0, ReorderLevel = 0, Discontinued = false, RestockDate = restockDate },
        new Product { ProductID = 9, ProductName = "Mishi Kobe Niku", SupplierID = 4, CategoryID = 6, QuantityPerUnit = "18 - 500 g pkgs.", UnitPrice = 97.00m, UnitsInStock = 29, UnitsOnOrder = 0, ReorderLevel = 0, Discontinued = true },
        new Product { ProductID = 10, ProductName = "Ikura", SupplierID = 4, CategoryID = 8, QuantityPerUnit = "12 - 200 ml jars", UnitPrice = 31.00m, UnitsInStock = 31, UnitsOnOrder = 0, ReorderLevel = 0, Discontinued = false },
        new Product { ProductID = 11, ProductName = "Queso Cabrales", SupplierID = 5, CategoryID = 4, QuantityPerUnit = "1 kg pkg.", UnitPrice = 21.00m, UnitsInStock = 22, UnitsOnOrder = 30, ReorderLevel = 30, Discontinued = false },
        new Product { ProductID = 12, ProductName = "Queso Manchego La Pastora", SupplierID = 5, CategoryID = 4, QuantityPerUnit = "10 - 500 g pkgs.", UnitPrice = 38.00m, UnitsInStock = 86, UnitsOnOrder = 0, ReorderLevel = 0, Discontinued = false },
        new Product { ProductID = 13, ProductName = "Konbu", SupplierID = 6, CategoryID = 8, QuantityPerUnit = "2 kg box", UnitPrice = 6.00m, UnitsInStock = 24, UnitsOnOrder = 0, ReorderLevel = 5, Discontinued = false },
        new Product { ProductID = 14, ProductName = "Tofu", SupplierID = 6, CategoryID = 7, QuantityPerUnit = "40 - 100 g pkgs.", UnitPrice = 23.25m, UnitsInStock = 35, UnitsOnOrder = 0, ReorderLevel = 0, Discontinued = false },
        new Product { ProductID = 15, ProductName = "Genen Shouyu", SupplierID = 6, CategoryID = 2, QuantityPerUnit = "24 - 250 ml bottles", UnitPrice = 15.50m, UnitsInStock = 39, UnitsOnOrder = 0, ReorderLevel = 5, Discontinued = false },
        new Product { ProductID = 16, ProductName = "Pavlova", SupplierID = 7, CategoryID = 3, QuantityPerUnit = "32 - 500 g boxes", UnitPrice = 17.45m, UnitsInStock = 29, UnitsOnOrder = 0, ReorderLevel = 10, Discontinued = false },
        new Product { ProductID = 17, ProductName = "Alice Mutton", SupplierID = 7, CategoryID = 6, QuantityPerUnit = "20 - 1 kg tins", UnitPrice = 39.00m, UnitsInStock = 0, UnitsOnOrder = 0, ReorderLevel = 0, Discontinued = true },
        new Product { ProductID = 18, ProductName = "Carnarvon Tigers", SupplierID = 7, CategoryID = 8, QuantityPerUnit = "16 kg pkg.", UnitPrice = 62.50m, UnitsInStock = 42, UnitsOnOrder = 0, ReorderLevel = 0, Discontinued = false },
        new Product { ProductID = 19, ProductName = "Teatime Chocolate Biscuits", SupplierID = 8, CategoryID = 3, QuantityPerUnit = "10 boxes x 12 pieces", UnitPrice = 9.20m, UnitsInStock = 25, UnitsOnOrder = 0, ReorderLevel = 5, Discontinued = false },
        new Product { ProductID = 20, ProductName = "Sir Rodney's Marmalade", SupplierID = 8, CategoryID = 3, QuantityPerUnit = "30 gift boxes", UnitPrice = 81.00m, UnitsInStock = 40, UnitsOnOrder = 0, ReorderLevel = 0, Discontinued = false }
    ];
    List<Category> categories = [
        new Category { CategoryID = 1, CategoryName = "Beverages", Description = "Soft drinks, coffees, teas, beers, and ales" },
        new Category { CategoryID = 2, CategoryName = "Condiments", Description = "Sweet and savory sauces, relishes, spreads, and seasonings" },
        new Category { CategoryID = 3, CategoryName = "Confections", Description = "Desserts, candies, and sweet breads" },
        new Category { CategoryID = 4, CategoryName = "Dairy Products", Description = "Cheeses" },
        new Category { CategoryID = 5, CategoryName = "Grains/Cereals", Description = "Breads, crackers, pasta, and cereal" },
        new Category { CategoryID = 6, CategoryName = "Meat/Poultry", Description = "Prepared meats" },
        new Category { CategoryID = 7, CategoryName = "Produce", Description = "Dried fruit and bean curd" },
        new Category { CategoryID = 8, CategoryName = "Seafood", Description = "Seaweed and fish" }
    ];
    List<Order> orders;

    public DataService() {
        orders = GenerateOrders(150);
    }
    public IEnumerable<Customer> GetCustomers() => customers;
    public IEnumerable<Product> GetProducts() => products;
    public IEnumerable<Category> GetCategories() => categories;
    public IEnumerable<Order> GetOrders() => orders;
    List<Order> GenerateOrders(int count) {
        Random random = new Random();
        var generatedOrders = new List<Order>();
        for (int i = 1; i <= count; i++) {
            var customer = customers[random.Next(customers.Count)];
            var order = new Order {
                Id = i,
                Customer = customer,
                OrderDate = DateTime.Now.AddDays(-random.Next(1, 500)),
                Items = new ObservableCollection<OrderItem>()
            };

            int itemsCount = random.Next(1, 5);
            for (int j = 0; j < itemsCount; j++) {
                var product = products[random.Next(products.Count)];
                order.Items.Add(new OrderItem {
                    Id = i * 10 + j,
                    Order = order,
                    Product = product,
                    Quantity = random.Next(1, 10)
                });
            }

            customer.Orders.Add(order);
            generatedOrders.Add(order);
        }
        return generatedOrders;
    }
}

Program.cs

// ...
builder.Services.AddScoped<DataService>();

Implement Cascading ComboBoxes

To implement cascading cell editors, place DxComboBox components in the EditFormTemplate. Bind each ComboBox to the corresponding edit model field and use the Data property to populate cascading editors with data.

In the following example, the Country ComboBox lists countries. When a user selects a country, the ValueChanged handler updates the Country field and clears the current City value. The City ComboBox filters its bound data source based on the selected country and displays matching cities.

Razor

@inject NwindDataService NwindDataService
@inject WorldcitiesDataService WorldcitiesDataService

<DxGrid Data="DataSource"
        KeyFieldName="SupplierId"
        EditModelSaving="Grid_EditModelSaving"
        DataItemDeleting="Grid_DataItemDeleting">
    <Columns>
        <DxGridCommandColumn Width="110px" />
        <DxGridDataColumn FieldName="CompanyName" />
        <DxGridDataColumn FieldName="ContactName" />
        <DxGridDataColumn FieldName="Country" Width="10%" />
        <DxGridDataColumn FieldName="City" Width="10%" />
    </Columns>        
    <EditFormTemplate Context="EditFormContext">
        @{
            var supplier = (Supplier)EditFormContext.EditModel;
        }
        <DxFormLayout CssClass="w-100">
            <DxFormLayoutItem Caption="Company Name:" ColSpanMd="6">
                @EditFormContext.GetEditor("CompanyName")
            </DxFormLayoutItem>
            <DxFormLayoutItem Caption="Contact Name:" ColSpanMd="6">
                @EditFormContext.GetEditor("ContactName")
            </DxFormLayoutItem>
            <DxFormLayoutItem Caption="Country:" ColSpanMd="6">
                <DxComboBox Data="@Countries"
                            NullText="Select Country..."
                            SearchMode="@ListSearchMode.AutoSearch"
                            SearchFilterCondition="@ListSearchFilterCondition.Contains"
                            TextFieldName="CountryName"
                            ValueFieldName="CountryName"
                            Value="@supplier.Country"
                            ValueExpression="() => supplier.Country"
                            ValueChanged="(string newCellValue) => {
                                                supplier.Country = newCellValue;
                                                supplier.City = null;
                                            }">
                </DxComboBox>
            </DxFormLayoutItem>
            <DxFormLayoutItem Caption="City:" ColSpanMd="6">
                @{
                    var countryId = Countries.Where(c => c.CountryName == supplier.Country)
                                             .FirstOrDefault()?.CountryId;
                    var cities = Cities.Where(x => x.CountryId == countryId);
                }
                <DxComboBox Data="@cities"
                            NullText="Select City..."
                            SearchMode="@ListSearchMode.AutoSearch"
                            SearchFilterCondition="@ListSearchFilterCondition.Contains"
                            @bind-Value="@supplier.City"
                            TextFieldName="CityName"
                            ValueFieldName="CityName">
                </DxComboBox>
            </DxFormLayoutItem>
        </DxFormLayout>
    </EditFormTemplate>  
</DxGrid>

@code {
    IEnumerable<Supplier> DataSource { get; set; }
    IEnumerable<Country> Countries { get; set; }
    IEnumerable<City> Cities { get; set; }

    protected override async Task OnInitializedAsync() {
        DataSource = await NwindDataService.GetSuppliersEditableAsync();
        Countries = await WorldcitiesDataService.GetCountriesAsync();
        Cities = await WorldcitiesDataService.GetCitiesAsync();
    }
    async Task Grid_EditModelSaving(GridEditModelSavingEventArgs e) {
        if (e.IsNew)
            await NwindDataService.InsertSupplierAsync((Supplier)e.EditModel);
        else
            await NwindDataService.UpdateSupplierAsync((Supplier)e.DataItem, (Supplier)e.EditModel);
        await UpdateDataAsync();
    }
    async Task Grid_DataItemDeleting(GridDataItemDeletingEventArgs e) {
        await NwindDataService.RemoveSupplierAsync((Supplier)e.DataItem);
        await UpdateDataAsync();
    }
    async Task UpdateDataAsync() {
        DataSource = await NwindDataService.GetSuppliersEditableAsync();
    }
}

Supplier.cs

using System;
using System.Collections.Generic;

namespace BlazorDemo.Data.Northwind {
    public partial class Supplier {
        public Supplier() {
            Products = new HashSet<Product>();
        }
        public int SupplierId { get; set; }
        public string CompanyName { get; set; }
        public string ContactName { get; set; }
        public string ContactTitle { get; set; }
        public string Address { get; set; }
        public string City { get; set; }
        public string Region { get; set; }
        public string PostalCode { get; set; }
        public string Country { get; set; }
        public string Phone { get; set; }
        public string Fax { get; set; }
        public string HomePage { get; set; }
        public virtual ICollection<Product> Products { get; set; }
    }
}

Country.cs

namespace BlazorDemo.Data.Worldcities {
    public class Country {
        public int CountryId { get; set; }
        public string CountryName { get; set; }
        public int CapitalId { get; set; }
    }
}

City.cs

namespace BlazorDemo.Data.Worldcities {
    public class City {
        public int CityId { get; set; }
        public string CityName { get; set; }
        public int CountryId { get; set; }
    }
}