How to add new Row in GridView inside AJAX TabContainer in ASP.Net

Hi,

am using a  gridview in my asp.net web form.i have an Ajax Tab container with 4 tabs in each tab i have a Gridview,and Each gridview have a Button to Add New Row to gridview.i need to write a function or method to add new Row in gridview.

i dont want to write code for each griview add new row button.i need to write a Common function to Add new rows and call the function while Button click.