How to make select all in C#.NET

[sk27ahmed]

Any One can tell me how to checked all row in the datagridview on button click event.
I create on column of type " DataGridViewCheckBoxColumn" in dataGridView via edit column property and rest of the column will come from database directly.Now I want to checked all the row in the datagrid on button click event.
Remember I want it only in C#.net.
When I make search on google all code available for asp.net + C#.net, but i want only in C#.net.

I also try to used "GridViewRow and FindControl" but it showing me error

' The type or namespace name 'GridViewRow' could not be found (are you missing a using directive or an assembly reference?)'.

So any on know solution.Please tell me on my id [removed mail id]

Thanks

[debasisdas]

Kindly post what code you have tried sofar.

[sk27ahmed]

Uptil now i am not able to write any specific code for this. I just try some statement which i got from google,but failed.