Vlori statici GridView

  Dim iIndex As Integer = 0
        For Each dtrRiga As DataRow In dt.Rows
            dtrRiga("descriptor") = String.Format("Indice {0}", iIndex)
            iIndex += 1
        Next

For i As Integer = 0 To dt.Rows.Count - 1
            dt.Rows(i)("descriptor") = String.Format("Indice {0}", i)
        Next

   For i As Integer = 0 To dt.Rows.Count - 1

            Dim str As String = String.Empty

            Select Case i
                Case 0
                    str = "pippo"
                Case 1
                    str = "paperino"
            End Select

            dt.Rows(i)("descriptor") = str
        Next