I want to make a gridview in asp.net which allow user to add new row in database from header or from footer of gridview.

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ASP.NET4

I want to make a gridview in asp.net which allow user to add new row in Database from Header or from footer of gridview.
suppose i have four column in my database table and i have a gridview on my webpage in asp.net web application . now i want to give add new row facility by same gridview which will show data of database table . so i want to use gridview header or footer space for adding new row in database and refresh gridview data at the same time .
Please help me .

What I have tried:

i had create a gridview on a webpage and bind all data from database table on that gridview but now i want to use same gridview for inserting new row in database table . and for that purpose i want to use gridview header or footer . please help me or send me links where i can find the solutiion of my porblem.