using view state previous page property

                    first take default.aspx page and default2.aspx page then do this coding
           
                  
                   
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;

public
partial class _Default : System.Web.UI.Page

{protected void Page_Load(object sender, EventArgs e)
{
}protected void Button1_Click(object sender, EventArgs e)
{

Label1.Text = DateTime.Now.ToString();
Server.Transfer("Default2.aspx");
}
}

on default2.aspx page


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 Default2 : System.Web.UI.Page
{protected void Page_Load(object sender, EventArgs e)
{if(!IsPostBack)
{Label tb = (Label)PreviousPage.FindControl("Label1");
Response.Write(tb.Text);}

}
}
output will come current date of your system