.net - Winforms UnauthorizedAccessException C# -

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im trying upload & download file google drive via c#. upload process working great when im download file im error.i search on google , stackoverflow cant pass error.

string desktop = environment.getfolderpath(environment.specialfolder.desktop);     string filepath = desktop + @"\derslerim\"+textbox2.text;     directory.createdirectory(filepath);

and

 using (var filestream = new filestream(filepath,filemode.create,fileaccess.write))      {          filestream.write(memorystream.getbuffer(), 0, memorystream.getbuffer().length);      }

that code blocks create directory , create file areas. please me!


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