Validate blank textbox using CustomValidator in asp.net

Satyapriyanayak
Posted by Satyapriyanayak under ASP.NET category on | Points: 40 | Views : 807
<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="Default.aspx.cs" Inherits="Blank__textbox_CustomValidator._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">

<div>

<div>

<asp:Label

id="lblName"

Text="Name:"

AssociatedControlID="txtName"

Runat="server" />

<br />

<asp:TextBox

id="txtName"

Runat="server" />

<asp:CustomValidator ID="cv_name" runat="server" ControlToValidate="txtName"

Text="Name should not be blank" ValidateEmptyText="true" onservervalidate="cv_name_ServerValidate"

></asp:CustomValidator><br />





<asp:Button

id="btnSubmit"

Text="Submit"

Runat="server" />

</div>

</div>

</form>

</body>

</html>







using System;

using System.Collections;

using System.Configuration;

using System.Data;

using System.Linq;

using System.Web;

using System.Web.Security;

using System.Web.UI;

using System.Web.UI.HtmlControls;

using System.Web.UI.WebControls;

using System.Web.UI.WebControls.WebParts;

using System.Xml.Linq;



namespace Blank__textbox_CustomValidator

{

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

{



protected void cv_name_ServerValidate(object source, ServerValidateEventArgs args)

{

if (args.Value.Length != 0)

args.IsValid = true;

else

args.IsValid = false;

}

}

}

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