c# - Determine sender when second form opens? -

i have been learning c# , wpf on recent project of mine , have run issue determining sender when form opens. have main form listbox bound list of objects. used following code handle user double clicking line in list box:

        <listbox.itemcontainerstyle>             <style targettype="{x:type listboxitem}" basedon="{staticresource {x:type listboxitem}}">                 <eventsetter event="mousedoubleclick" handler="listboxitem_mousedoubleclick"/>             </style>         </listbox.itemcontainerstyle> 

where have run issue want launch second form (named "addproject") when user double clicks, launch same form , button on main form. need determine (the double click or button click) launched secondary form can change appropriately.

in main form, can use window_loaded method, , read sender name, when try use same in secondary form, doesn't work. works in main form, not secondary:

   private void window_loaded(object sender, routedeventargs e)     {         messagebox.show(sender.tostring());      } 

when button clicked, following code run open addproject form:

   private void btnaddproject_click(object sender, routedeventargs e)    {         addproject frm = new addproject();         frm.showdialog();    } 

i know determining sender common issue on stack-overflow, couldn't find answer how determine sender has opened second form. figured run in window_load method of second form, doesn't seem work. or link discussion answer question appreciated!

presumably have this:

private void listboxitem_mousedoubleclick(object sender, routedeventargs e) {      addproject frm = new addproject();      frm.showdialog(); } 

and of course you've explicitly stated have this:

private void btnaddproject_click(object sender, routedeventargs e) {      addproject frm = new addproject();      frm.showdialog(); } 

why can't change addproject class constructor, , pass appropriate flag? this:

class addproject {     private bool _frombutton;      public addproject(bool frombutton)     {         _frombutton = frombutton;         initializecomponent();     } } 

then methods this:

private void listboxitem_mousedoubleclick(object sender, routedeventargs e) {      addproject frm = new addproject(false);      frm.showdialog(); }  private void btnaddproject_click(object sender, routedeventargs e) {      addproject frm = new addproject(true);      frm.showdialog(); }