c# - Iteration over dynamically added nested controls -

i have groupbox on winform. groupbox added in run time within first groupbox.

few picturebox controls added within second groupbox.

now iterate pictureboxes.

currently code is:

foreach (control gbfirst in this.controls) {     groupbox firstgroupbox = gbfirst groupbox; //first groupbox     if (firstgroupbox != null)     {         foreach (control gbsecond in firstgroupbox.controls)         {             groupbox secondgroupbox = gbsecond groupbox; //second groupbox             if (secondgroupbox != null)             {                 foreach (control item in secondgroupbox.controls)                 {                     var pb = item picturebox; // picturebox                     if (pb != null)                     {                         string pbtag = pb.tag.tostring();                         string customtag = ipaddress + "onoff";                         if (pb.tag.tostring() == ipaddress + "onoff")                         {                             methodinvoker action = delegate                             {                                 pb.image = properties.resources.mobicheckeronpng16;                             };                             pb.begininvoke(action);                             break;                         }                     }                 }             }          }     } } 

but, unlike above, think there may easy or smart way it.

is so?

a generic function use control type in container @ levels:

public static list<t> findcontrols<t>(control container, bool dig) t : control {     list<t> retval = new list<t>();     foreach (control item in container.controls)     {         if (item t)             retval.add((t)item);         if (dig && item.controls.count > 0)             retval.addrange(findcontrols<t>(item, dig));     }     return retval; } 

the dig variable controls whether or not iterate through child container controls. example if want find picturebox controls starting first groupbox (gbfirst), must call

findcontrols<picturebox>(gbfirst, true); 

if set dig false, controls in input cotainer enumerated.