Another way is that the ascx file must be included in the aspx file. For example, if your control file is called "test.ascx", then in the aspx file it will say something like "~ / controls /" testing.ascx. Thus, a very simple way to see all the files that are included in ascx is through powershell.
powershell, , ( , "" , , ):
GetChildItem -recurse | Select-String -pattern ", " | |