c# - How to set an object's transparency via a Slider -

i'm attempting learn c#. (working visual studio 2015, window application project) trying set opacity of main window via hbar slider.

i first assumed set int (the value of sidebar), , set opacity of window via value.

i having issues calling value of opacity window.

using system; using system.collections.generic; using system.componentmodel; using system.data; using system.drawing; using system.linq; using system.text; using system.threading.tasks; using system.windows.forms;  namespace clock {     public partial class root : form     {         int window_transparency;         public root()         {             initializecomponent();         }          private void form1_load(object sender, eventargs e)         {          }          private void sbar_transp_001_scroll(object sender, scrolleventargs e)         {             sbar_transp_001.value = window_transparency;             root.equals.opacity = windows_transparency;         }     } } 

"root.equals.opacity" gives error:

error cs0119 'object.equals(object)' method, not valid in given context

i googled around, , found nothing seemed relevant.

please forgive inexperience assume quite simple. if point me in proper way of setting values of objects in c#, i'd appreciative. (bonus points opacity, rather general syntax :d)

remember: opacity ranges 0 1, so, if control varies 0 100, need:

 this.opacity = (trackbar1.value/100); 

(suppose you're using trackbar control).