ServerValidateEventArgs.Value Property

 

Gets the value to validate in the custom event handler for the ServerValidate event.

Namespace:   System.Web.UI.WebControls
Assembly:  System.Web (in System.Web.dll)

Public ReadOnly Property Value As String

Property Value

Type: System.String

The value to validate in the custom event handler for the ServerValidate event.

Use the Value property determine the value to validate in the custom event handler for the ServerValidate event. Notice that you cannot programmatically change this value.

The following example demonstrates how to use the Value property to determine the value to validate.


<%@ Page Language="VB" AutoEventWireup="True" %>

<!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>
    <title>CustomValidator ServerValidate Example</title>
<script runat="server">

      Sub ValidateBtn_OnClick(sender As Object, e As EventArgs) 

         ' Display whether the page passed validation.
         If Page.IsValid Then 

            Message.Text = "Page is valid."

         Else 

            Message.Text = "Page is not valid!"

         End If

      End Sub

      Sub ServerValidation(source As Object, args As ServerValidateEventArgs)

         Try 

            ' Test whether the value entered into the text box is even.
            Dim num As Integer = Integer.Parse(args.Value)
            args.IsValid = ((num mod 2) = 0)

         Catch ex As Exception

            args.IsValid = false

         End Try

      End Sub

   </script>    

</head>
<body>

   <form id="form1" runat="server">

      <h3>CustomValidator ServerValidate Example</h3>

      <asp:Label id="Message"
           Text="Enter an even number:" 
           Font-Names="Verdana" 
           Font-Size="10pt" 
           runat="server"
           AssociatedControlID="Text1" />

      <br />

      <asp:TextBox id="Text1" 
           runat="server" />

      &nbsp;&nbsp;

      <asp:CustomValidator id="CustomValidator1"
           ControlToValidate="Text1"
           Display="Static"
           ErrorMessage="Not an even number!"
           ForeColor="green"
           Font-Names="verdana" 
           Font-Size="10pt"
           OnServerValidate="ServerValidation"
           runat="server"/>

      <br />

      <asp:Button id="Button1"
           Text="Validate" 
           OnClick="ValidateBtn_OnClick" 
           runat="server"/>

   </form>

</body>
</html>

.NET Framework
Available since 1.1
Return to top
Show: