Problems with vb.net UPDATE statement for MS Access

Dim Conn As New OleDbConnection
        Conn.ConnectionString = My.Settings.ConnReminder
        Conn.Open()
        Dim strSQL As String
        strSQL = " SELECT * FROM tblReminders"

        Dim ds As New DataSet
        Dim dt As New DataTable
        Dim da As New OleDbDataAdapter(strSQL, Conn)
        Dim row As DataRow
        Dim strReminderText As String
        Dim strSubject As String
        Dim strRemNo As String
        Dim donecount As Integer
        donecount = 1

        da.Fill(dt)
        MsgBox(dt.Rows.Count)

        For Each row In dt.Rows
            If row("MMDept").ToString = "MBM" Then
                donecount = donecount + 1
                strRemNo = row("RemNo").ToString
                strSubject = row("Subject").ToString
                strReminderText = row("ReminderText").ToString

                Dim myCommand As New OleDbCommand("UPDATE tblReminders SET [ReminderText] = @strSubject, [Subject] = @strReminderText WHERE [RemNo]= @strRemNo", Conn)

                With myCommand.Parameters
                    .AddWithValue("@strSubject", strSubject)
                    .AddWithValue("@strReminderText", strReminderText)
                    .AddWithValue("@strRemNo", strRemNo)
                End With
                da.UpdateCommand = myCommand
                da.Update(dt)
            End If
            
        Next
        dt.AcceptChanges()

        MsgBox(donecount)

        Conn.Close()
        MsgBox("Done")

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