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Availability of name in login page in csharp

Posted By:satyapriyanayak       Posted Date: May 25, 2013    Points: 40    Category:    URL: http://www.dotnetspark.com  

We can Verify Availability of name in database.
 

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";

        }

 

    }

 

}




     

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