Unable to evaluate expression because the code is optimized or a native frame is on top of the call

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C#

int index = Convert.ToInt32(e.CommandArgument);
                   string path = "select FileData,extension,upload_filename,contentType from ImprestExpenseDetails where BillNo='" + index + "'";
                   DataSet ds = new DataSet();
                   ds = objcBLL.GetQueryResult(path, "ImageView");
                   if (ds.Tables["ImageView"].Rows.Count > 0)
                   {
                       Byte[] bytes = (Byte[])ds.Tables["ImageView"].Rows[0]["FileData"];
                       string extension = (string)ds.Tables["ImageView"].Rows[0]["extension"];
                       string filename = (string)ds.Tables["ImageView"].Rows[0]["upload_filename"];
                       string contenttype = (string)ds.Tables["ImageView"].Rows[0]["contentType"];

                       if (extension == ".pdf")
                       {
                           string fpath = Server.MapPath("~/" + filename);
                           Response.Buffer = true;
                           Response.Charset = "";
                           Response.Cache.SetCacheability(HttpCacheability.NoCache);
                           Response.ContentType = contenttype;
                           Response.AddHeader("content-disposition", "attachment;filename=" + filename);
                           Response.BinaryWrite(bytes);
                           Response.Flush();
                           Response.End();
                       }


                       if (extension == ".jpg")
                       {

                       }
                   }

What I have tried:

I got the error on Response.End()
i use HttpContext.Current.ApplicationInstance.CompleteRequest(); inplace of Response.End();
after using this error is resolved but file is not downloaded.
Please help

Posted 29-Mar-16 23:50pm

prakash00060

Updated 29-Mar-16 23:59pm

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OriginalGriff · Answer 1 · 2016-03-29T23:59:00

If you get an error message you don't understand, Google it:
Unable to evaluate expression because the code is optimized or a native frame is on top of the call - Google Search[^]
As you can see, you aren't the first to have this problem.
Start looking at some of the links, and you will find this: asp.net - Response.End() throwing an Error - Stack Overflow[^] which is probably the same problem (and a solution).
Response.End is designed to terminate a page - so if you have an synchronous download going at the same time, then yes, it will probably terminate it.