VAGSuite.frmMain.FindMaxTableValue C# (CSharp) Method

        private int FindMaxTableValue(string symbolname, int orgvalue)
        {
            int retval = orgvalue;
            foreach (DevExpress.XtraBars.Docking.DockPanel pnl in dockManager1.Panels)
            {
                foreach (Control c in pnl.Controls)
                {
                    if (c is MapViewerEx)
                    {
                        MapViewerEx vwr = (MapViewerEx)c;
                        if (vwr.Map_name == symbolname)
                        {
                            if (vwr.MaxValueInTable > retval) retval = vwr.MaxValueInTable;
                        }
                    }
                    else if (c is DevExpress.XtraBars.Docking.DockPanel)
                    {
                        DevExpress.XtraBars.Docking.DockPanel tpnl = (DevExpress.XtraBars.Docking.DockPanel)c;
                        foreach (Control c2 in tpnl.Controls)
                        {
                            if (c2 is MapViewerEx)
                            {
                                MapViewerEx vwr2 = (MapViewerEx)c2;
                                if (vwr2.Map_name == symbolname)
                                {
                                    if (vwr2.MaxValueInTable > retval) retval = vwr2.MaxValueInTable;
                                }
                            }
                        }
                    }
                    else if (c is DevExpress.XtraBars.Docking.ControlContainer)
                    {
                        DevExpress.XtraBars.Docking.ControlContainer cntr = (DevExpress.XtraBars.Docking.ControlContainer)c;
                        foreach (Control c3 in cntr.Controls)
                        {
                            if (c3 is MapViewerEx)
                            {
                                MapViewerEx vwr3 = (MapViewerEx)c3;
                                if (vwr3.Map_name == symbolname)
                                {
                                    if (vwr3.MaxValueInTable > retval) retval = vwr3.MaxValueInTable;
                                }
                            }
                        }
                    }
                }
            }
            return retval;
        }