vb.net - "Object reference not set to an instance of an object" error when using radio buttons to fill in a listbox -


i wanted ask if knew why might getting error object reference not set instance of object when try fill in listbox playlist function on media player trying make.

public class playlistsform      private sub radiobutton1_checkedchanged(byval sender system.object, byval e system.eventargs) handles radiobutton1.checkedchanged         listbox1.items.clear()         each item string in my.settings.playlist1             listbox1.items.add(item)         next     end sub      private sub radiobutton2_checkedchanged(byval sender system.object, byval e system.eventargs) handles radiobutton2.checkedchanged         dim pl2 new setting(my.settings.playlist2)         listbox1.items.clear()         each item string in my.settings.playlist2             listbox1.items.clear()             listbox1.items.add(item)         next     end sub      private sub radiobutton3_checkedchanged(byval sender system.object, byval e system.eventargs) handles radiobutton3.checkedchanged         listbox1.items.clear()         each item string in my.settings.playlist3             listbox1.items.clear()             listbox1.items.add(item)         next     end sub      private sub radiobutton4_checkedchanged(byval sender system.object, byval e system.eventargs) handles radiobutton4.checkedchanged         listbox1.items.clear()         each item string in my.settings.playlist4             listbox1.items.clear()             listbox1.items.add(item)         next     end sub      private sub radiobutton5_checkedchanged(byval sender system.object, byval e system.eventargs) handles radiobutton5.checkedchanged         listbox1.items.clear()         each item string in my.settings.playlist5             listbox1.items.clear()             listbox1.items.add(item)         next     end sub      private sub label1_click(byval sender system.object, byval e system.eventargs) handles label1.click         listbox1.selecteditems.clear()     end sub end class

sorry - error happening here: (error 'object reference not set instance of object')

    private sub radiobutton1_checkedchanged(byval sender system.object, byval e system.eventargs) handles radiobutton1.checkedchanged         listbox1.items.clear()         each item string in my.settings.playlist1             listbox1.items.add(item)         next     end sub      private sub radiobutton2_checkedchanged(byval sender system.object, byval e system.eventargs) handles radiobutton2.checkedchanged         dim pl2 new setting(my.settings.playlist2)         listbox1.items.clear()         each item string in my.settings.playlist2             listbox1.items.clear()             listbox1.items.add(item)         next     end sub      private sub radiobutton3_checkedchanged(byval sender system.object, byval e system.eventargs) handles radiobutton3.checkedchanged         listbox1.items.clear()         each item string in my.settings.playlist3             listbox1.items.clear()             listbox1.items.add(item)         next     end sub      private sub radiobutton4_checkedchanged(byval sender system.object, byval e system.eventargs) handles radiobutton4.checkedchanged         listbox1.items.clear()         each item string in my.settings.playlist4             listbox1.items.clear()             listbox1.items.add(item)         next     end sub      private sub radiobutton5_checkedchanged(byval sender system.object, byval e system.eventargs) handles radiobutton5.checkedchanged         listbox1.items.clear()         each item string in my.settings.playlist5             listbox1.items.clear()             listbox1.items.add(item)         next     end sub


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