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public class BasePage : System.Web.UI.Page  
  {  
  public BasePage()  
  {  
  }  
  protected override void OnInit(EventArgs O)  
  {  
  if (base.Session["UserId"] == null || base.Session["UserId"].ToString().Equals(""))  
  {  
  Response.Redirect("~/Error.aspx");  
  }  
  }  
  }  
public partial class Error : System.Web.UI.Page  
  {  
  protected void Page_Load(object sender, EventArgs e)  
  {  
  Response.Write(" <script>top.location.href='login.aspx'; </script>");  
  }  
  }  

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public class BasePa