<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="Default.aspx.cs" Inherits="Check_Data_dosenot_exist_database._Default" %>





   


   

   

            BackColor="#FF99FF" Font-Bold="True" Width="329px" onclick="btn_check_Click"
         />

            Width="197px" ForeColor="#FF3300">
       
   
            ControlToValidate="txtUserName" ErrorMessage="*Name Required">
   
   

            ForeColor="Black">
   

   

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 Check_Data_dosenot_exist_database
{
    public partial class _Default : System.Web.UI.Page
    {
        string connStr = ConfigurationManager.ConnectionStrings["ConnectionString"].ConnectionString;
        SqlCommand com;
        string str;

        protected void btn_check_Click(object sender, EventArgs e)
        {
            SqlConnection con = new SqlConnection(connStr);
            con.Open();
            str = "select count(*)from employee where ename='" + txtUserName.Text + "'";
            com = new SqlCommand(str, con);
            int count = Convert.ToInt32(com.ExecuteScalar());
            if (count > 0)
            {
                lblMessage.Text = "username exist";
            }
            else
            {
                lblMessage.Text = "username doesnot exist";
            }
        } 
    }
}