How can i perform automatic updates (of course by checking) a boolean field from the gridview?

I already enable the linqdatasource in Advanced Options.

Code below:

<asp:Che开发者_如何转开发ckBoxField DataField="ValidData" HeaderText="Valid Risk Item" 
            SortExpression="ValidData" />

http://msdn.microsoft.com/en-us/library/bb514963.aspx