Cannot get Datakey Value from a Gridview in vb.net

I am new to the gridview in .net 2.0.
i am tying to get the id for the record that i select in the grid.
this is my code
 Protected Sub GridView1_RowEditing(ByVal sender As Object, ByVal e As System.Web.UI.WebControls.GridViewEditEventArgs) Handles GridView1.RowEditing
        Dim tempid As String
        tempid = GridView1.SelectedDataKey.Item(
     

        myBL.Load(tempid)
    End Sub

this is the line that i cannot figure out
GridView1.SelectedDataKey.Item(

i have a Datakey set that is the index of my dataset.
do i need to create a column to beable to use the value of it or is it like vs 2003 where you set the datakey and once you reference it you  using e.item.item value you have the value and can use it

please help
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