Question : problem saving datagridview back to mysql vb.net

Hy,

I can load the db into the datagridview.
i'm trying to save changes made in the datagridview to be stored back to the mysql db.
But i'm not getting any errors and its not saving.

Any id ?

vb.net vs 2008 
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Public Class Form1
    Dim connetionString As String
    Dim connection As MySqlConnection
    Dim adapter As MySqlDataAdapter
    Dim cmdBuilder As MySqlCommandBuilder
    Dim ds As New DataSet
    Dim changes As DataSet
    Dim sql As String
    Dim i As Int32

Private Sub BekijkAllesToolStripMenuItem_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles BekijkAllesToolStripMenuItem.Click
        Dim connetionString As String = ("Data Source=site;Initial Catalog=catalog;User ID=id;Password=pw")

        connection = New MySqlConnection(connetionString)
        sql = "select * from Herstellingen2"
        Try
            connection.Open()
            adapter = New MySqlDataAdapter(sql, connection)
            adapter.Fill(ds)
            connection.Close()
            Herstellingen.DataSource = ds.Tables(0)
        Catch ex As Exception
            MsgBox(ex.ToString)
        End Try
    End Sub

    Private Sub SaveToolStripButton_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles SaveToolStripButton.Click
        Try
            cmdBuilder = New MySqlCommandBuilder(adapter)
            changes = ds.GetChanges()
            If changes IsNot Nothing Then
                adapter.Update(changes)
            End If
            MsgBox("Opgeslagen")
        Catch ex As Exception
            MsgBox(ex.ToString)
        End Try

Answer : problem saving datagridview back to mysql vb.net

See this link: [downloadable]
1) http://www.sourcecodester.com/visual-basic-net/how-add-update-delete-record-using-mysql.html
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