Delete Record using checkbox in Gridview in c#

[Sam]

Hello All,
I m new user to c# .Net 2.0
i want to implement a gridview that displays all records in database(sql server 2000) & which containd checkbox field..
Now i want that whenever this form is displayed then user can be able to change the status of that checkboxes for each record. & when delete button is pressed then all the checked records should be deleted..
The problem is that i added checkbox field in gridview but when i run it checkboxes are not editable ..
pls help me..
Thanx in advance..

Regards,
Sam