get a non displayed from a grid

I hve a grid with an ID field supplied from a stored peocedure that I am trying to get the vaule from like this
            If e.CommandName = "Select" Then
                Session("intID") = Me.grdSam.SelectedDataKey
            End If
but this does not wotk
What is the correct way to get the vaule?
expertsexchangehunterAsked:
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Munawar HussainPrincipal Software EngineerCommented:
if you have datagrid or griview visible property to false then value will not be available..
you may put grid in a div and make div visibility falase. using style (in that way grid would get rendered and value would be available.

if you want to get value of a column which is set to visible=false then provide header text for the invisible column and try to get the value.
thanks
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