Sort expression and the sort direction

sortby = e.SortExpression & " " & sortingdirection

Protected Sub GridView1_OnSorting(ByVal sender As Object, ByVal e As GridViewSortEventArgs) Handles GridView1.Sorting
        Dim sortingdirection, sortby
        If e.SortDirection = SortDirection.Ascending Then
            sortingdirection = SortDirection.Descending
        Else
            sortingdirection = SortDirection.Ascending
        End If
        sortby = e.SortExpression & " " & sortingdirection
        Dim connStr, cmdStr As String
        connStr = "conn string works"
        cmdStr = "SELECT [ido],[JD],[Xecl3],[Yecl3],[Zecl3] FROM OrbitDates;"
        Dim MyDataSet As New DataSet
        Dim MyDataTable As New DataTable()
        Try
            Using conn As New SqlConnection(connStr)
                Using cmd As New SqlCommand(cmdStr, conn)
                    conn.Open()
                    cmd.ExecuteNonQuery()
                    Using MyDataAdaptor As New SqlDataAdapter(cmd)
                        MyDataAdaptor.Fill(MyDataSet)
                        MyDataTable = MyDataSet.Tables(0)
                        Dim MyDataView As New DataView(MyDataTable)
                        MyDataView.Sort = sortby
                        GridView1.DataSource = MyDataView
                        GridView1.DataBind()
                        GridView1.PageIndex = Convert.ToInt32(ViewState("pageIndex"))
                    End Using
                    conn.Close()
                    cmd.Dispose()
                    conn.Dispose()
                End Using
            End Using
        Catch ex As Exception
            Throw ex
        End Try
    End Sub