Public Sub btn_4_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btn_4.Click
        Try
            Me.TableLayoutPanel1.RowStyles.Clear()
            Me.TableLayoutPanel1.ColumnStyles.Clear()
        Catch errore_di_connessione As Exception
            MsgBox("alt : " + errore_di_connessione.Message)
        Finally
        End Try
    End Sub