gridview with static and dynamic column

Question

I am using a gridview in my code,

I wanted to display some columns Statically(in common everytime I run my program)

and i need to append some more columns to the existing gridview based on the selection i choose in the webpage(i.e., dynamically)

And I want Serial No's to be updated based on the data that is displayed.

Can Any one Help me with this?

Thank You.