LINQ to Entities CLR Methods Mapping

It's very useful to have this in mind when you write lambda expressions or use LINQ to Entities

For example, you can't compare GUID to string using ToString() Method in the lambda expression as ToString() Doesn't have a mapping, but you can use New GUID 

http://msdn.microsoft.com/en-us/library/bb738681(v=vs.110).aspx

Useful Entity Framework Tutorials

It's rare to find a complete tutorials' series like W3Schools but this site make a great series for Entity Framework http://www.entityframeworktutorial.net/