Check Data dosenot exist database

Posted by Satyapriyanayak under ASP.NET category on | Points: 40 | Views : 720

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

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "">

<html xmlns="" >
<head runat="server">
<title>Untitled Page</title>
<form id="form1" runat="server">
<asp:Button ID="btn_check" runat="server" Text="Check Data dosenot exist database"
BackColor="#FF99FF" Font-Bold="True" Width="329px" onclick="btn_check_Click"
/><br />
<asp:Label ID="Labelcheck" Text="Please enter any name to be verified from the database" runat="server" BackColor="#FFFF99"
Width="197px" ForeColor="#FF3300"></asp:Label>
<asp:TextBox ID="txtUserName" runat="server" Width="197px"></asp:TextBox>

<asp:RequiredFieldValidator ID="RequiredFieldValidator1" runat="server"
ControlToValidate="txtUserName" ErrorMessage="*Name Required"></asp:RequiredFieldValidator>

<br />
<asp:Label ID="lblMessage" runat="server" BackColor="#FF3300"

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);
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";
lblMessage.Text = "username doesnot exist";

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