Example of CustomValidator control Samples and examples

Custome Validator control is used to write method to handle the validatin.
Drag and drop two lable control ,one textbox control ,one button control and one
custome validator control in aspx page.

In Custome Validator:-

Set ControlToValidate Property equal to "txtUsername"
Set ServerValidate Property equal to "ValidateUser"
Set Text Property "A username must be between 8 and 16 characters"
ServerValidate property is used to specifies the name of the server side validation function to be executed.


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

<!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>Untitled Page</title>
  
</head>
<body>
    <form id="form1" runat="server">
    <asp:Label runat="server" Text="Enter a username: " />
<asp:TextBox id="txtUsername" runat="server" />
<asp:Button ID="Button1" Text="Submit" runat="server"/>
<br />
<asp:Label id="mess" runat="server"/>
<br />
<asp:CustomValidator ID="CustomValidator1" ControlToValidate="txtUsername" ServerValidate="ValidateUser" Text="A username must be between 8 and 16 characters" runat="server"/>
</form>

    
 

    
</body>
</html>

In code behind



Partial Class _Default
    Inherits System.Web.UI.Page

    Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load

    End Sub

    Sub ValidateUser(ByVal source As Object, ByVal args As ServerValidateEventArgs)
        If Len(args.Value) < 8 Or Len(args.Value) > 16 Then
            args.IsValid = False
        Else
            args.IsValid = True
        End If
    End Sub


End Class

Post Comment:

Notify me by email when others post comments to this article.

Do not include your name, "with regards" etc in the comment. Write detailed comment, relevant to the topic.

No HTML formatting and links to other web sites are allowed.

This is a strictly moderated site. Absolutely no spam allowed.

Name:	Sign In to fill automatically.
Email:	(Will not be published, but required to validate comment)
	Type the numbers and letters shown on the left.

Online Members

Example of CustomValidator control

Post Comment:

Email subscription