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Validate blank textbox using CustomValidator in Asp.net

Posted By:satyapriyanayak       Posted Date: January 13, 2015    Points: 40    Category: ASP.NET Controls    URL: http://www.dotnetspark.com  

In this Code Snippets we will know how to validate blank textbox using CustomValidator in asp.net.
 

<%@ 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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