WPF: Populate a listbox on window load

How can it be done with c#?

I'm able to populate a listbox on a button click, but don't know how it can be done on application startup.

Thanks.

Put the same code in the constructor of the form.

Double click on the form (empty space).

This will generate a Window_Loaded(...) {}; event.

Put your code between the curly braces.