Programtically gated check in using C#

Hello All, 

we have defined build definitions for our project and whenever we want to check in any files so it will go through that gated check in

Now i wanted to do this same Pragmatically.  Following things needs to be done 

1. Check out of the file  ( done ) 

2. Now check in the changes using gated check in which is mandatory 

How can i do it  using c# or any pointers are highly appreciated