Hi,

The Assembly might be constrained by the Code Access Security Policy.

Hope this article helps:

http://msdn2.microsoft.com/en-us/library/aa302361.aspx

Hi,

The Assembly might be constrained by the Code Access Security Policy.

Hope this article helps:

http://msdn2.microsoft.com/en-us/library/aa302361.aspx

Thank you all guys.
I debugged that app on the server and found that the error caused by a bug code.
I use server.mappath to get the physical path of a XML file.
At this case, the file name is "" so the MapPath return the path to the parent folder of XML file.
That 's the way the error occurs.