In this blog we can Verify Availability of name in database.
<%@ Page Language="C#"
AutoEventWireup="true"
CodeFile="Default.aspx.cs" Inherits="_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:Button
ID="Button1" runat="server" Text="Availability of name
from the database"
BackColor="#FF99FF"
Font-Bold="True" Width="329px"
onclick="Button1_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"
ForeColor="Black"></asp:Label>
</form>
</body>
</html>
using System;
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;
public partial class _Default : System.Web.UI.Page
{
string connStr =
ConfigurationManager.ConnectionStrings["ConnectionString"].ConnectionString;
SqlCommand com ;
string str =
null;
protected void Button1_Click(object sender,
EventArgs e)
{
namecheck();
}
public void
namecheck()
{
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 = "Sorry! you can't take this username";
}
else
{
lblMessage.Text = "You can take this username";
}
}
}