RequiredFieldValidationPattern.IsRequired Property

Gets or sets a value that specifies whether the editor is a required field.

Namespace: DevExpress.Web

Assembly: DevExpress.Web.v23.2.dll

NuGet Package: DevExpress.Web

Declaration

C#

[DefaultValue(false)]
public bool IsRequired { get; set; }

VB.NET

<DefaultValue(False)>
Public Property IsRequired As Boolean

Property Value

Type	Default	Description
Boolean	false	true if the editor is a required field; otherwise, false.

Remarks

Note

When a grid-based control is in Batch Edit mode, set the Display property to Dynamic, so as not to render the empty space (the validation error element) near the edit cell.

Web Forms:

ASPX

...
<dx:GridViewDataComboBoxColumn FieldName="Answer">
    <PropertiesComboBox>
          ...
        <ValidationSettings Display="Dynamic">
            <RequiredField IsRequired="true" />
          </ValidationSettings>
    </PropertiesComboBox>
</dx:GridViewDataComboBoxColumn>
...

MVC:

C#

settings.CellEditorInitialize = (s, e) => {
    ASPxEdit editor = (ASPxEdit)e.Editor;
    editor.ValidationSettings.Display = Display.Dynamic;
};

Online Example

View Example: How to raise validation on the client

Example

JS

function OnValidationCompleted(s, e) {
    if(e.isValid && Password.GetValue() != ConfirmedPassword.GetValue()) {
        ConfirmedPassword.SetFocus();
        ErrorMessageNotEqual.SetVisible(true);
        e.isValid = false;
    } else
        ErrorMessageNotEqual.SetVisible(false);
}

ASPX

<script runat="server">
     protected void Page_Load(object sender, EventArgs e) {

     }
     protected void ASPxGlobalEvents1_ValidationCompleted(object sender, 
         DevExpress.Web.ValidationCompletedEventArgs e) {
         lErrorMessageNotEqual.ClientVisible 
            = !tbPassword.Value.Equals(tbConfirmedPassword.Value);
     }
</script>
...
         Type password:<br/>
         <dxe:ASPxTextBox ID="tbPassword" runat="server" Width="170px" 
         ClientInstanceName="Password" Password="True">
         <ValidationSettings SetFocusOnError="true">
             <RequiredField IsRequired="True" />
         </ValidationSettings>
         </dxe:ASPxTextBox>
         <br/>
         Confirm password:
         <dxe:ASPxTextBox ID="tbConfirmedPassword" runat="server" Width="170px" 
          ClientInstanceName="ConfirmedPassword" Password="True">
             <ValidationSettings SetFocusOnError="true">
                 <RequiredField IsRequired="True" />
             </ValidationSettings>
         </dxe:ASPxTextBox>
...