On Datakeyname in Gridview properties, I have "cid, firstname"), but why this won't work?

    Protected Sub GridView1_SelectedIndexChanged(ByVal sender As Object, ByVal e As System.EventArgs) Handles GridView1.SelectedIndexChanged

        Dim idNum As String = Me.GridView1.SelectedDataKey.Value("cid").ToString
        Dim idNum2 As String = Me.GridView1.SelectedDataKey.Value("firstname").ToString

        Dim URL As String = [String].Concat("test.aspx?cid=", idNum & idNum2)


    End Sub
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I don't believe that GridView1.SelectedDataKey.Value accepts a string. Maybe try something like GridView1.SelectedDataKey.Item("[name]").ToString()

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