What is wrong with my Gridview

I have a simple gridview with a simple SQLDataSource.  When I click the "EDIT" Button I can change a value in the Grid, But when I Click the "Update" button the changed cell reverts to it's previous value and when I cleck the "Drlrtr" button I get a error -"
Server Error in '/' Application. Must declare the scalar variable "@EmailID".  
I've tried numerous variations to my html but none are working.  I think my html (see below) is correct yet it isnot working.  Is this corruption or am I missing something?  Thanks for any Ideas you care to offer........................Phil Hoop
Relevant HTML is inserted
<asp:GridView ID="gvEmai ...