I found a great DAL and it is MIT licensed. Can I use this code without getting into trouble?
From Wikipedia:
It is a permissive license, meaning that it permits reuse within proprietary software on the condition that the license is distributed with that software.
As long as you don't pretend you wrote the code but you distribute and assign copyright correctly you won't get in trouble.
If you distribute the MIT code then you also need to ensure you distribute the license (thanks Neil for pointing that out).
Odd question. Follow the license and you can use it. It's probably the most permissive and easiest to read and understand open source license out there.
It depends. Probably not the answer you are looking for, but it really depends on your situation and employer.
However, you probably can use it. MIT is one of the licenses that is more compatible with commercial licensing. You can use it in your commercial applications, and you are not required to make your application open source as well (unlike the GPL).