File uploaded to ftp server is corrupted c# -

i'm not sure why file corrupted. i'm not using streamreader has been common problem have had. uploads can't seem find issue on why file corrupted after searching through various solved stack overflow questions.

    public actionresult uploadftpfile(httppostedfilebase promoimgfile)     {         bool issavedsuccessfully = true;         string filename = null;         string completedpath = "xxxxx";         string username = "xxxx";         string password = "xxxxx";         ftpwebrequest ftpclient;         ftpwebrequest ftprequest;         list<string> directories = new list<string>();          try         {             foreach (string fileitemname in request.files)             {                 httppostedfilebase file = request.files[fileitemname];                 filename = file.filename;                 if (file != null && file.contentlength > 0)                 {                     //create ftpwebrequest object                     ftpclient = (ftpwebrequest)ftpwebrequest.create(new uri("ftp://" + completedpath + "/" + filename));                     //set request method                     ftpclient.method = webrequestmethods.ftp.uploadfile;                      //set credentials                     ftpclient.credentials = new networkcredential(username, password);                      //opens file read                     stream objfile = file.inputstream;                      //by default keepalive true, control connection not closed after command executed.                     ftpclient.keepalive = true;                      //set data transfer type                     ftpclient.usebinary = true;                      //set content length                     ftpclient.contentlength = file.contentlength;                      //get stream of file                     stream objstream = ftpclient.getrequeststream();                      byte[] buffer = new byte[objfile.length];                     //write file content                     objstream.write(buffer, 0, buffer.length);                      objstream.close();                     objfile.close();                  }             }         }         catch(exception ex)         {             throw ex;             issavedsuccessfully = false;         }          //return json(new { promoimgfile = directories });         return redirecttoaction("index", "home", new { promoimgfile = directories });     } 

it's line right here:

   stream objfile = file.inputstream; 

years of learning, figured out 1 thing works:

memorystream ms = new memorystream(); file.inputstream.copyto(ms); 

then work off memorystream.