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Validate Textbox using javascript while register

Posted By:satyapriyanayak       Posted Date: June 28, 2014    Points: 40    Category: ASP.NET Controls    URL: http://www.dotnetspark.com  

In this Code Snippets we will know how to Validate Textbox using javascript.

<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="WebForm1.aspx.cs" Inherits="Validate_Textbox_using_javascript.WebForm1" %>

<!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>
    <script language="javascript" type="text/javascript">
        function validate()
      if (document.getElementById("<%=txt_name.ClientID%>").value=="")
                 alert("Name Feild can not be blank");
                 return false;
     return true;
    <form id="form1" runat="server">
        <asp:TextBox ID="txt_name" runat="server"></asp:TextBox>
    <asp:Button ID="btn_register" runat="server"  OnClientClick ="javascript:validate()"
                        Text="Register" onclick="btn_register_Click"/>
        <asp:Label ID="lblmsg" runat="server" Text="Label"></asp:Label>                  

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;
using System.Data.SqlClient;
namespace Validate_Textbox_using_javascript
    public partial class WebForm1 : System.Web.UI.Page
        string connStr = ConfigurationManager.ConnectionStrings["ConnectionString"].ConnectionString;
        SqlCommand com;

        protected void btn_register_Click(object sender, EventArgs e)
            if (txt_name.Text == "")

                SqlConnection con = new SqlConnection(connStr);
                com = new SqlCommand();
                com.Connection = con;
                com.CommandType = CommandType.Text;
                com.CommandText = "insert into test values(@name)";
                com.Parameters.AddWithValue("@name", txt_name.Text);

                if (con.State == ConnectionState.Closed)
                lblmsg.Text = "Data entered successfully!!!";


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