HELP Synchronize in C#

Question

Does anyone know how to synchronize two databases on different servers through C#?

What confuses me most is the comparing of the two databases. Note that the two databases can have the same data due to previous synchronizations. Also, the two databases can have different data but the same primary key.

I'm new in c#.. this is my first program... if someone try to help me, try explain a little more..=)
Thanks