Permission denied error while converting .mov to .flv using ffmpeg in C# application

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C#

ASP.NET

ffmpeg

i am using ffmpeg to convert .MOV video to .flv and i get the below error knowing that i am sure that there is a permission because i extract image from video to the same directory in the same screen :

ffmpeg.StartInfo.Arguments = "ffmpeg -i " + file + " -ar 22050 -ab 32 -f flv -s 320×240 -aspect 4:3 -y " + flv;

ffmpeg version N-63968-g73d820e Copyright (c) 2000-2014 the FFmpeg developers
built on Jun 15 2014 00:52:21 with gcc 4.8.3 (GCC)
configuration: --enable-gpl --enable-version3 --disable-w32threads --enable-a
isynth --enable-bzlib --enable-fontconfig --enable-frei0r --enable-gnutls --ena
le-iconv --enable-libass --enable-libbluray --enable-libcaca --enable-libfreety
e --enable-libgme --enable-libgsm --enable-libilbc --enable-libmodplug --enable
libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libop
njpeg --enable-libopus --enable-librtmp --enable-libschroedinger --enable-libso
r --enable-libspeex --enable-libtheora --enable-libtwolame --enable-libvidstab
-enable-libvo-aacenc --enable-libvo-amrwbenc --enable-libvorbis --enable-libvpx
--enable-libwavpack --enable-libwebp --enable-libx264 --enable-libx265 --enable
libxavs --enable-libxvid --enable-decklink --enable-zlib
libavutil 52. 89.100 / 52. 89.100
libavcodec 55. 66.101 / 55. 66.101
libavformat 55. 43.100 / 55. 43.100
libavdevice 55. 13.101 / 55. 13.101
libavfilter 4. 8.100 / 4. 8.100
libswscale 2. 6.100 / 2. 6.100
libswresample 0. 19.100 / 0. 19.100
libpostproc 52. 3.100 / 52. 3.100
C:\application\UploadandDownloadFiles\UploadandDownloadFiles: Permission denied