aspnet-devexpress-dot-web-dot-validationeventargs-7fd3fc71.md
Gets or sets a value specifying whether the validated value is valid.
Namespace : DevExpress.Web
Assembly : DevExpress.Web.v25.2.dll
NuGet Package : DevExpress.Web
public bool IsValid { get; set; }
Public Property IsValid As Boolean
| Type | Description |
|---|---|
| Boolean |
true if the value is valid; otherwise, false.
|
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.
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.
<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>
<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.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";
}
}
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.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 snippet (auto-collected from DevExpress Examples) contains a reference 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.
e.IsValid = e.Value != null;
if (!e.IsValid){
If Not Page.IsCallback Then
e.IsValid = e.Value IsNot Nothing
If Not e.IsValid Then
See Also