What should I do to make my C# programming too strong

Hi Vincent,
There is nothing perfect in world but perfect means best fit in the context everywhere.

First thing you should love the subject. Then only you can remember what you have studied. This is very important because remembering is the key to shine in any subject. 

Second thing I agree with Akhil Garg advice that practice makes perfect. Not only for C# for any subject this is the remedy.

Hi 
Sam..
ck it...http://www.slideshare.net/LearnItFirst/how-to-become-a-good-c-programmer

Just code and code and code. Experience matters to become strong in something. You could also read books, tutorials about the new features of C# and apply it in real application. Learning OOP also matters.