How to check mutiple check box in gridview

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C#5.0

In runmode in gridview as follows


Empid Empname Session1 Session2 Session3
header(Checkbox header(Checkbox) header(Checkbox)

1 GS Checkbox Checkbox Checkbox
2 RK Checkbox Checkbox Checkbox
3 RJ Checkbox Checkbox Checkbox


When i click the Session1header checkbox i want all session1 checkbox column to be checked in gridview.

Similiarily when i click the Session2 header checkbox i want all the session2 checkbox column to be checked in gridview.

Similiarily when i click the Session3 header checkbox i want all the session3 checkbox column to be checked in gridview.


For that how can i do in asp.net using c#.