hey frnds i want to know that how to add Textbox entry into the dataGridView.

Suppose I have DataGridView with two Columns-
First Column--name
Second Column--marks.

On the Form--
I have a Combobox ,Two Textboxes ,Button,Gridview.
User select roll from combobox,Suppoes he Select Rol number 1 ,I want that on button click Name & marks of Roll Number 1 are added to the DatatgridView.