I am getting Execute permission was denied on the object 'xp\_cmdshell'.

Here's the situation, I have a stored procedure called ExportFile.
I am calling the stored procedure via SqlCommand from a web application from a Virtual PC..
during the execution of this command i get permission error

Then I debug it via SQL profiler and execute the result from the profiler to a query window (this means i run the StoredProcedure with the necessary parameters basing from the profiler to a Query window) and surprisingly its working just fine. the file was exported successfully.

I wonder whats wrong with this considering that my login in the connection string is an owner and admin user.