da = New MySqlDataAdapter("SELECT id,nachname,nummer from telefonliste", _
       myConnection)
     Try
         da.Fill(dt3)
     Catch ex As Exception
         MessageBox.Show(ex.Message)
     End Try
     Me.dgvtelefonliste.DataSource = dt3

 
        Me.dgvtelefonliste.Columns.Add("", "id")
        Me.dgvtelefonliste.Columns.Add("", "nachname")
        Me.dgvtelefonliste.Columns.Add("", "nummer")
 
        da = New MySqlDataAdapter("SELECT id,nachname,nummer from" & _
          "telefonliste", myConnection)
        Try
            da.Fill(dt)
        Catch ex As Exception
            MessageBox.Show(ex.Message)
        End Try
        For Each dr As DataRow In dt.Rows
            Me.dgvtelefonliste.Rows.Add(dr("id"), dr("nachname"), dr("nummer"))
        Next