SecurityException Unhandled Error

Question

Hi,

I've just finished reading my first C# book and I think it's great.  I'm trying to increase my skills by programming as much as I can but half the time I try to write something useful I end up with messages telling me that a SecurityException was unhandled.

The troubleshooting tips I receive are fairly generic and not much use.  I think it must be something fundamental that I'm doing wrong because I get the error so often.  Anyway, I'm baffled and would appreciate someone pointing me in the right direction.

Thank you.

Matt