VB.NET Sum สอบถามเรื่องการรวมราคาใน ListView เพื่อออกมาเป็น ผลรวมครับ

 ListView1.Items.Clear()
        Dim TABLE As New DataTable
        Dim i As Integer
        Dim MySqlConnection As MySqlConnection
        MySqlConnection = New MySqlConnection()
        MySqlConnection.ConnectionString = "server=localhost;user id=root;password=1234; database =137"
        MySqlConnection.Open()
        Dim myadapter As New MySqlDataAdapter
        Dim sqlquery = "select *from Order_buy where or_no ='" & TextBox1.Text & "';"
        Dim command As New MySqlCommand
        With command
            .Connection = MySqlConnection
            .CommandText = sqlquery
        End With
        With myadapter
            .SelectCommand = command
            .Fill(TABLE)
        End With
        For i = 0 To TABLE.Rows.Count - 1
            With ListView1
                .Items.Add(TABLE.Rows(i)("spa_code"))
                With .Items(.Items.Count - 1).SubItems
                    .Add(TABLE.Rows(i)("spa_name"))
                    .Add(TABLE.Rows(i)("spa_version"))
                    .Add(TABLE.Rows(i)("spa_price"))
                    .Add(TABLE.Rows(i)("or_quan"))
                    .Add(TABLE.Rows(i)("or_price"))
                End With
            End With
        Next