using System;
using System.Data;
using System.Configuration;
using System.Collections;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;

public partial class _2 : System.Web.UI.Page
{
    
protected void Page_Load(object sender, EventArgs e)
    {
        
if (!IsPostBack)
        {
           ViewState[
"BackUrl"= Request.UrlReferrer.ToString();
        }
    }
    
protected void Button1_Click(object sender, EventArgs e)
    {
        Response.Redirect(ViewState[
"BackUrl"].ToString());
    }
}

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