c# - Attach an EventHandler Defined in One Class to an Element Defined in a Different Class -

searched around syntax couldn't find anything. have event handler defined in main file , want attach element creating in different class. know syntax adding event handler inside class is

element.previewmousedown += eventhandlername; 

but i'm not sure syntax adding handler that's in seperate class. tried

element.previewmousedown += mainwindow.eventhandlername; 

but invalid. appreciated

you need reference instance want receive handler. cannot refer class (unless handler static method):

void main() {     var = new a();     var b = new b();      a.event += b.handler; // reference instance method }  class {     public event eventhandler event; }  class b {     public void handler(object sender, eventargs args)     {      } } 

if have static handler, like:

void main() {     var = new a();      a.event += b.handler; // reference static method }  class {     public event eventhandler event; }  class b {     public static void handler(object sender, eventargs args)     {      } }