How To Make writable a cell of datagrid in vs 2010.

Question

hey frnds..

 

i want to enter some value in  cells of datagrid  in desktop application.

I have make the readonly property of datagrid false. But i m not geting  to do this..

 

I have to edit the value in cell of datagrid only.. i dnt want to take the value of grid in textbox and update... 

 

 i have googled also but till nw i have not found any soluation...