Exception returning: unable to evaluate expression because the code is optimized or a native frame is on top of the call stack

Question

catch (Exception ex) is returning "unable to evaluate expression because the code is optimized or a native frame is on top of the call stack" in this code:

 cmsql = cnsql.CreateCommand(); 
 cmsql.CommandText = strsql;
 cmsql.CommandType = CommandType.Text; 
 reader = cmsql.ExecuteReader();
 if (reader.HasRows) {
 while (reader.Read()) { 
 Session["User_Email"] = reader["User_Email"].ToString().Trim(); 
 Session["User_Birthday"] = reader["User_birthday"].ToString().Trim(); }
 Response.Redirect("Default.aspx"); }

What could be the reason?

Answer 1

Try adding another parameter to Response.Redirect method. If you use Response.Redirect without second parameter, the exception ThreadAbortException occurs.

Response.Redirect("Default.aspx",false);

PRB: ThreadAbortException Occurs If You Use Response.End, Response.Redirect, or Server.Transfer