ValidationEventArgs.IsValid Property

Gets or sets a value specifying whether the validated value is valid.

Assembly: DevExpress.Web.v18.2.dll

Declaration

C#
VB.NET

public bool IsValid { get; set; }

Public Property IsValid As Boolean

Property Value

Type	Description
Boolean	true if the value is valid; otherwise, false.

Remarks

Use the IsValid property to specify whether the value obtained via the ValidationEventArgs.Value property meets your validation criteria, and can be posted to an editor being validated.

If the entered value is not valid, you can set the IsValid property to false. In this case, the value will not be posted to the editor and a error text specified by the ValidationEventArgs.ErrorText property will be displayed. Or, you can correct the entered value manually by setting the ValidationEventArgs.Value property and leaving the IsValid value set to true. In this case, the corrected value will be written to the editor.

Example

This example demonstrates how to validate editors in a container on the server side. The ASPxEdit.ValidateEditorsInContainer method is used to determine the validity of editors within a callback panel.

Note

A complete sample project is available at https://github.com/DevExpress-Examples/how-to-validate-editors-in-the-container-on-the-server-side-e3633

<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default.aspx.cs" Inherits="_Default" %>

<%@ Register Assembly="DevExpress.Web.v11.1, Version=11.1.9.0, Culture=neutral, PublicKeyToken=b88d1754d700e49a"
    Namespace="DevExpress.Web.ASPxCallbackPanel" TagPrefix="dx" %>
<%@ Register Assembly="DevExpress.Web.v11.1, Version=11.1.9.0, Culture=neutral, PublicKeyToken=b88d1754d700e49a"
    Namespace="DevExpress.Web.ASPxPanel" TagPrefix="dx" %>
<%@ Register Assembly="DevExpress.Web.ASPxEditors.v11.1, Version=11.1.9.0, Culture=neutral, PublicKeyToken=b88d1754d700e49a"
    Namespace="DevExpress.Web.ASPxEditors" TagPrefix="dx" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
    <title>How to validate editors in container </title>

    <script type="text/javascript" language="javascript">
        function Validate(s, e) {
            if (ASPxClientEdit.ValidateGroup('testGroup'))
                ClientCallbackPanelDemo.PerformCallback('');
        }
    </script>

</head>
<body>
    <form id="form1" runat="server">
    <div>
        <dx:ASPxButton ID="ASPxButtonSave" runat="server" Text="Validate" AutoPostBack="False">
            <ClientSideEvents Click="Validate" />
        </dx:ASPxButton>
        <br />
        <dx:ASPxCallbackPanel ID="ASPxCallbackPanelDemo" runat="server"  HideContentOnCallback="False"
            ClientInstanceName="ClientCallbackPanelDemo" OnCallback="ASPxCallbackPanelDemo_Callback">
            <PanelCollection>
                <dx:PanelContent ID="PanelContent1" runat="server">
                    <table cellspacing="0" cellpadding="4" runat="server" id="serverContainer">
                        <tr>
                            <td style="width: 60px;">
                                <dx:ASPxLabel runat="server" ID="NameLabel" AssociatedControlID="txtNum1" Text="Number 1:" />
                            </td>
                            <td>
                                <dx:ASPxTextBox ID="txtNum1" runat="server" Width="170px" OnValidation="ASPxTextBoxTest_Validation">
                                    <ValidationSettings ValidationGroup="testGroup">
                                        <RequiredField IsRequired="True" ErrorText="Number 1 is required" />
                                    </ValidationSettings>
                                </dx:ASPxTextBox>
                            </td>
                        </tr>
                        <tr>
                            <td style="width: 60px;">
                                <dx:ASPxLabel runat="server" ID="ASPxLabel1" AssociatedControlID="txtNum2" Text="Number 2:" />
                            </td>
                            <td>
                                <dx:ASPxTextBox ID="txtNum2" runat="server" Width="170px" OnValidation="ASPxTextBoxTest_Validation">
                                    <ValidationSettings ValidationGroup="testGroup">
                                        <RequiredField IsRequired="True" ErrorText="Number 2 is required"/>
                                    </ValidationSettings>
                                </dx:ASPxTextBox>
                            </td>
                        </tr>
                    </table>
                </dx:PanelContent>
            </PanelCollection>
        </dx:ASPxCallbackPanel>
    </div>
    </form>
</body>
</html>

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using DevExpress.Web.ASPxEditors;
using DevExpress.Web.ASPxCallbackPanel;

public partial class _Default : System.Web.UI.Page {


    protected void Page_Init (object sender, EventArgs e) {

    }

    protected void ASPxCallbackPanelDemo_Callback (object sender, DevExpress.Web.ASPxClasses.CallbackEventArgsBase e) {
        ASPxCallbackPanel callbackPanel = (ASPxCallbackPanel)sender;
        bool isValid = ASPxEdit.ValidateEditorsInContainer(callbackPanel);
    }
    protected void ASPxTextBoxTest_Validation (object sender, ValidationEventArgs e) {
        ASPxTextBox txt = sender as ASPxTextBox;
        int val;
        bool result = Int32.TryParse(txt.Text, out val);
        e.IsValid = result;
        e.ErrorText = "An input value should be a number";
    }
}

<%@ Page Language="vb" AutoEventWireup="true" CodeFile="Default.aspx.vb" Inherits="_Default" %>

<%@ Register Assembly="DevExpress.Web.v11.1, Version=11.1.9.0, Culture=neutral, PublicKeyToken=b88d1754d700e49a"
    Namespace="DevExpress.Web.ASPxCallbackPanel" TagPrefix="dx" %>
<%@ Register Assembly="DevExpress.Web.v11.1, Version=11.1.9.0, Culture=neutral, PublicKeyToken=b88d1754d700e49a"
    Namespace="DevExpress.Web.ASPxPanel" TagPrefix="dx" %>
<%@ Register Assembly="DevExpress.Web.ASPxEditors.v11.1, Version=11.1.9.0, Culture=neutral, PublicKeyToken=b88d1754d700e49a"
    Namespace="DevExpress.Web.ASPxEditors" TagPrefix="dx" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
    <title>How to validate editors in container </title>

    <script type="text/javascript" language="javascript">
        function Validate(s, e) {
            if (ASPxClientEdit.ValidateGroup('testGroup'))
                ClientCallbackPanelDemo.PerformCallback('');
        }
    </script>

</head>
<body>
    <form id="form1" runat="server">
    <div>
        <dx:ASPxButton ID="ASPxButtonSave" runat="server" Text="Validate" AutoPostBack="False">
            <ClientSideEvents Click="Validate" />
        </dx:ASPxButton>
        <br />
        <dx:ASPxCallbackPanel ID="ASPxCallbackPanelDemo" runat="server"  HideContentOnCallback="False"
            ClientInstanceName="ClientCallbackPanelDemo" OnCallback="ASPxCallbackPanelDemo_Callback">
            <PanelCollection>
                <dx:PanelContent ID="PanelContent1" runat="server">
                    <table cellspacing="0" cellpadding="4" runat="server" id="serverContainer">
                        <tr>
                            <td style="width: 60px;">
                                <dx:ASPxLabel runat="server" ID="NameLabel" AssociatedControlID="txtNum1" Text="Number 1:" />
                            </td>
                            <td>
                                <dx:ASPxTextBox ID="txtNum1" runat="server" Width="170px" OnValidation="ASPxTextBoxTest_Validation">
                                    <ValidationSettings ValidationGroup="testGroup">
                                        <RequiredField IsRequired="True" ErrorText="Number 1 is required" />
                                    </ValidationSettings>
                                </dx:ASPxTextBox>
                            </td>
                        </tr>
                        <tr>
                            <td style="width: 60px;">
                                <dx:ASPxLabel runat="server" ID="ASPxLabel1" AssociatedControlID="txtNum2" Text="Number 2:" />
                            </td>
                            <td>
                                <dx:ASPxTextBox ID="txtNum2" runat="server" Width="170px" OnValidation="ASPxTextBoxTest_Validation">
                                    <ValidationSettings ValidationGroup="testGroup">
                                        <RequiredField IsRequired="True" ErrorText="Number 1 is required"/>
                                    </ValidationSettings>
                                </dx:ASPxTextBox>
                            </td>
                        </tr>
                    </table>
                </dx:PanelContent>
            </PanelCollection>
        </dx:ASPxCallbackPanel>
    </div>
    </form>
</body>
</html>

Imports Microsoft.VisualBasic
Imports System
Imports System.Collections.Generic
Imports System.Linq
Imports System.Web
Imports System.Web.UI
Imports System.Web.UI.WebControls
Imports DevExpress.Web.ASPxEditors
Imports DevExpress.Web.ASPxCallbackPanel

Partial Public Class _Default
    Inherits System.Web.UI.Page


    Protected Sub Page_Init(ByVal sender As Object, ByVal e As EventArgs)

    End Sub

    Protected Sub ASPxCallbackPanelDemo_Callback(ByVal sender As Object, ByVal e As DevExpress.Web.ASPxClasses.CallbackEventArgsBase)
        Dim callbackPanel As ASPxCallbackPanel = CType(sender, ASPxCallbackPanel)
        Dim isValid As Boolean = ASPxEdit.ValidateEditorsInContainer(callbackPanel)
    End Sub
    Protected Sub ASPxTextBoxTest_Validation(ByVal sender As Object, ByVal e As ValidationEventArgs)
        Dim txt As ASPxTextBox = TryCast(sender, ASPxTextBox)
        Dim val As Integer
        Dim result As Boolean = Int32.TryParse(txt.Text, val)
        e.IsValid = result
        e.ErrorText = "An input value should be a number"
    End Sub
End Class

The following code snippets (auto-collected from DevExpress Examples) contain references to the IsValid property.

Note

The algorithm used to collect these code examples remains a work in progress. Accordingly, the links and snippets below may produce inaccurate results. If you encounter an issue with code examples below, please use the feedback form on this page to report the issue.

C#
VB.NET

tutorial-creating-a-registration-form-using-aspxeditors-e4749/CS/ASPxEditorsTutorial.Step6/RegistrationForm.aspx.cs#L65


e.IsValid = e.Value != null;
if (!e.IsValid){

MVC-Data-Editors---Built-in-Validation/CS/CS/Models/BuiltInValidationData.cs#L75

if(e.Value == null) {
    e.IsValid = false;
    return;

client-and-server-validation-within-aspxgridviews-templates-e1464/CS/Default.aspx.cs#L44

if(!int.TryParse(edit.Value as string, out value)) {
    e.IsValid = false;
    e.ErrorText = "Input must be a number";

MVC-Data-Editors---Built-in-Validation/VB/CS/Models/BuiltInValidationData.vb#L80

If e.Value Is Nothing Then
    e.IsValid = False
    Return

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ValidationEventArgs.IsValid Property

Declaration

Property Value

Remarks

Example

ValidationEventArgs.IsValid Property

Declaration

Property Value

Remarks

Example

Related GitHub Examples