Datagrid on ASP.Net with C#

what i want to do is when i click on that particular column of a particular row that column is changed into edit mode.

my question is how can i get the mouse down event on that column of datagrid on web form well its stronly supported on windows application.

 

Thanks in advance

 

But what actually i want to do is without using such column(Add/Update/Delete) i want to change the column in edit mode.Ex:-i have 5 columns viz.id,name,address,occupation,contact no. in which id,name,address and occupation  are bounded with datasource while the contact no is unbounded column.on databinding ,datagrid fill with 5 records.now the actual thing is to be done.when i click the column contact no of row 4 than only that column is being in edit mode(remember without using Add/Update/Delete column) on client side.

 

thanks