What is the importance of T4 in Entity framework?

T4 files are heart in EF code generation. So the T4 code templates read the EDMX XML file and generate C# behind code. This C# behind code is nothing but your entity and context classes.


If you create a project using VS 2012, you will see the following hierarchy. At the top we have the EDMX file, followed by the TT or T4 file and then the .CS code file.