Add data in grid

[blossam]

hi friends,

i want to add data in grid at runtime
means when i click enter or tab i want a new row in grid so i can add value in that
i know how to do this in windows application
but i want to do this in web application

please help me if you know
i dont want to create row by using TableRow =new TableRow()
and add it to table

but i want to add row by click "enter" or "tab"