multithreading - Accessing form control from within a thread using delegates in vb.net -

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i have problem in updating form control thread using delegate.

this flow use.

dashboard screen(parent mdi window) -> quizscreen (child mdi window) once in quizscreen thread started , thread code kept in module(server.vb). thread need find , update control(which dynamically created)

following delegate code call inside thread 

public sub changepictimage(byval ipaddress string)     if me.invokerequired         dim del nodedelegate         del = addressof changepictimage         me.invoke(del, ipaddress)         'return     else         me.backcolor = color.green         me.backgroundimage = system.drawing.image.fromfile(application.startuppath & "\images\application-on.png")     end if       dim centerflowpanel flowlayoutpanel = ctype(quizscreen.centerflowpanel, flowlayoutpanel)     dim computericonspanel flowlayoutpanel = ctype(centerflowpanel.controls("computericonspanel"), flowlayoutpanel)     dim flowpanel flowlayoutpanel = ctype(computericonspanel.controls("flow_" + ipaddress), flowlayoutpanel)     dim pictcontrol picturebox = ctype(flowpanel.controls("pict_" + ipaddress), picturebox)     pictcontrol.image = system.drawing.image.fromfile(application.startuppath & "\images\application-on.png") end sub

i call delegate inside thread follows

threaddata.dashboard.changepictimage(ipaddress)

as may have noticed, have put delegate sub in dashboad.vb

i able find elements deepest level. infact can alert name , other properties when try set something. doesn't anything.

can me.


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