Public con As New MySqlConnection
    Public cmd As New MySqlCommand
    Public reader As MySqlDataReader
Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As _
  System.EventArgs) Handles MyBase.Load
   ' ..... bla bla bla login und andere Daten
 
 
        DataGridView1.VirtualMode = False
        tab_name = Tabellenname
        Try
            con.Open()
            cmd.CommandText = "select * from " & tab_name
            reader = cmd.ExecuteReader
            DataGridView1.Columns.Add("Name", "Name")
            Do While Start.reader.Read
                DataGridView1.Rows.Add(reader(Spaltenname))
            Loop
            reader.Close()
            con.Close()
        Catch ex As Exception
            con.Close()
            MsgBox(ex.Message)
        End Try
        DataGridView1.Visible = True
end sub