asp.net - IOException: The process cannot access the file 'filename' because it is being used by another process -


i have code in asp.net project: 

protected void btnsave_click(object sender, eventargs e)     {         try         {             using (streamwriter sw = file.createtext(server.mappath(@"~/aboutus.txt")))             {                 sw.write(freetextbox1.text);                 sw.close();                 sw.dispose();                 lblerror.text = "تغییرات با موفقیت ذخیره شد.";                 lblerror.cssclass = "success";             }         }         catch (exception ex)         {             lblerror.text = "خطایی روی داده است!" + "\n" + ex.tostring();             lblerror.cssclass = "error";          }                 {             lblerror.visible = true;         }      }

sometimes (not always) when hit btnsave following error occurred:

ioexception: process cannot access file 'filename' because being used process

why?

you run application after see windows task manager-->processes, notepad.exe running right click click end process . .


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