How can we do subheading in gridview in c#?

Hi, all memebers

 I need help on how to filter the contents of  a  database using textbox or combobox like the one in google which autocompletes in the same textbox or combobox  .

and also if  any one would help me on finding solution to making subheading in a gridview in c#.

I am very in need solution to these problems and would prefer receiving any help thank you very much.