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Error occured when redirect from .CS(class) file

Akki Ramanuj asked:

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i have one problem when i'll redirect from my class file than nullexception is fired but its only happen when my timer is called this class file..

my code is here:

              catch (Exception ex)
              SqlDataReader myReader = null;
              App.Global app = new App.Global();
              string important1 = app.ImportantData;

              string query = "SELECT     tbl_ApplicationAccess.Access,tbl_ApplicationAccess.Component1, tbl_ProductPurchaseMaster.ProductKey FROM tbl_ProductPurchaseMaster INNER JOIN tbl_ApplicationAccess ON tbl_ProductPurchaseMaster.CustomerRegistrationId = tbl_ApplicationAccess.CustomerID where tbl_ProductPurchaseMaster.ProductKey='" + important1 + "'";
              SqlCommand myCommand = new SqlCommand(query, myConnection);

              myReader = myCommand.ExecuteReader();
              string cmpnyname = "";
              string Access = "";
              while (myReader.Read())
                  Access = (myReader["Access"].ToString());
                  cmpnyname = (myReader["Component1"].ToString());

              if (Access.ToLower() == "false")
                  HttpContext.Current.Response.Redirect("../PageAccess.aspx");//IF TIMER CALL THIS SATATEMENT THAN ITS OCCURE NULLEXCEPTION ERROR OTHERWISE WORKING FINE
              else if (Access=="")
              { HttpContext.Current.Response.Redirect("../PageAccess.aspx"); }


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