c# - Stack overflow in unmanaged IP - Xamarion iOS -

i'm making small app ios in xamarin in visual studio 2015 keep getting error when run application:

critical: stack overflow in unmanaged: ip: 0x2e8785, fault addr: 0xbff07ffc

right background i'm doing. programmatically adding uicontrols main viewcontroller working fine code on place. decided reorganize mess new class display uicontrols. when did , ran application started getting error.

can me out or point me in right direction? if need see code let me know , i'll add in.

thanks.

* updated *

drawmenu.cs

namespace drawingcomponents {     class drawmenu     {         userinterfacecontrols uicontrols;           const int x_btn = 100;         const int y_btn = 100;         const int padding = 5;          float xmainportrait; // main views width         float ymainportrait; // main views height          float xsub; // subviews width inrelation mainviews dimensions.         float ysub; // subviews height inrelation mainview demensions.          float widthmainportrait = 205;         float heightmainportrait = 310;          public void portraitnormal(uiview view)         {             xmainportrait = ((float)view.bounds.size.width - widthmainportrait) / 2;             ymainportrait = ((float)view.bounds.size.height - heightmainportrait) / 2;              // draw frame             var mainframe = new cgrect(xmainportrait, ymainportrait, widthmainportrait, heightmainportrait);             uicontrols.mainview = new uiview(mainframe);               // x , y coordinants of mainview             xsub = (float)uicontrols.mainview.bounds.x;             ysub = (float)uicontrols.mainview.bounds.y;              // center of mainview , last button             float xcenter = ((float)uicontrols.mainview.bounds.size.width / 2) - (x_btn / 2);             float ycenter = (y_btn * 2) + (padding * 2);              // draw each component.             uicontrols.btn_myschedule.frame = new cgrect(xsub, ysub, x_btn, y_btn);             uicontrols.btn_mycareer.frame = new cgrect(xsub + x_btn + padding, ysub, x_btn, y_btn);             uicontrols.btn_mysocial.frame = new cgrect(xsub, ysub + y_btn + padding, x_btn, y_btn);             uicontrols.btn_feedback.frame = new cgrect(xsub + x_btn + padding, ysub + y_btn + padding, x_btn, y_btn);             uicontrols.btn_mydetails.frame = new cgrect(xcenter, ycenter, x_btn, y_btn);               uicontrols.mainview.autoresizingmask = uiviewautoresizing.flexiblemargins;              uicontrols.btn_myschedule.autoresizingmask = uiviewautoresizing.flexiblewidth;             uicontrols.btn_mycareer.autoresizingmask = uiviewautoresizing.flexiblewidth;             uicontrols.btn_mysocial.autoresizingmask = uiviewautoresizing.flexiblewidth;             uicontrols.btn_feedback.autoresizingmask = uiviewautoresizing.flexiblewidth;             uicontrols.btn_mydetails.autoresizingmask = uiviewautoresizing.flexiblewidth;               view.add(uicontrols.mainview);              uicontrols.mainview.addsubview(uicontrols.btn_myschedule);             uicontrols.mainview.addsubview(uicontrols.btn_mycareer);             uicontrols.mainview.addsubview(uicontrols.btn_mysocial);             uicontrols.mainview.addsubview(uicontrols.btn_feedback);             uicontrols.mainview.addsubview(uicontrols.btn_mydetails);         }      } } 

mainviewcontroller.cs

namespace drawingcomponents {     struct userinterfacecontrols     {         public uiview mainview;          public uibutton btn_myschedule;         public uibutton btn_mycareer;         public uibutton btn_mysocial;         public uibutton btn_feedback;         public uibutton btn_mydetails;     }       class mainviewcontroller : uiviewcontroller     {         userinterfacecontrols uicontrols;         drawmenu menu = new drawmenu();           public override void viewdidload()         {              base.viewdidload();               // instantiate menu buttons             uicontrols.btn_myschedule = new uibutton();             uicontrols.btn_mycareer = new uibutton();             uicontrols.btn_mysocial = new uibutton();             uicontrols.btn_feedback = new uibutton();             uicontrols.btn_mydetails = new uibutton();              // set image of each button             uicontrols.btn_myschedule.setimage(uiimage.fromfile("images/myschedule.png"), uicontrolstate.normal);             uicontrols.btn_mycareer.setimage(uiimage.fromfile("images/mycareer.png"), uicontrolstate.normal);             uicontrols.btn_mysocial.setimage(uiimage.fromfile("images/mysocial.png"), uicontrolstate.normal);             uicontrols.btn_feedback.setimage(uiimage.fromfile("images/feedback.png"), uicontrolstate.normal);             uicontrols.btn_mydetails.setimage(uiimage.fromfile("images/mydetails.png"), uicontrolstate.normal);              positioncontrols(interfaceorientation);         }          public override bool shouldautorotatetointerfaceorientation(uiinterfaceorientation tointerfaceorientation)         {             switch(tointerfaceorientation)             {                 case uiinterfaceorientation.landscapeleft:                 case uiinterfaceorientation.landscaperight:                 case uiinterfaceorientation.portrait:                 case uiinterfaceorientation.portraitupsidedown:                 default:                     return true;             }         }          public override void willanimaterotation(uiinterfaceorientation tointerfaceorientation, double duration)         {             base.willanimaterotation(tointerfaceorientation, duration);              positioncontrols(tointerfaceorientation);         }          protected void positioncontrols(uiinterfaceorientation tointerfaceorientation)         {             switch(tointerfaceorientation)             {                 case uiinterfaceorientation.landscapeleft:                 case uiinterfaceorientation.landscaperight:                     if (view.bounds.size.width > 480)                     {                         // add code here                     }                     else                     {                          // add code here                      }                     break;                 case uiinterfaceorientation.portrait:                 case uiinterfaceorientation.portraitupsidedown:                     if (view.bounds.width > 414)                     {                         // add code here                     }                     else                     {                         menu.portraitnormal(view);                     }                 break;         }         }     } }