request for the permission of type ‘fileiopermission’ failed. dynamics ax 2012

During one of my development i got following error, which occurs when I try to convert image into bits and stored in tables. I solved this by adding before the code

FileIoPermission _perm;

_perm = new FileIoPermission("c:\\File.txt",'r'); 
_perm.assert(); 

Reference: http://msdn.microsoft.com/en-us/library/fileiopermission.aspx