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;

public partial class validate : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
//getting info from demo.aspx using request.form
        string uname = Request.Form["txtuser"];
        string pwd=Request .Form ["txtpwd"];
        if (uname == "admin" && pwd == "admin123")
        {
//setting the context with key and value         
   Context.Items.Add("uname", uname);
//transfering page to welcome.aspx           
 Server.Transfer("welcome.aspx");


        }
//if not valid user this gets executed...
        else

        {
            Response.Write("not valid...");
        }
    }
}

public partial class welcome : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
     //retrieving the context value
        string name = Context.Items["uname"].ToString();
        Label1.Text = " welcome "+name;
    }
}