Everytime I have to work on some old Asp.Net shit. WebForms/WinForms etc.

Everything with that bullshitass designer. You wanna open a file you've just created? Sorry, error. Restart IDE and maybe...

Restarted website? Sorry. Old instance still hangs somewhere in IIS, so the port is taken...

Seeing code light up red when cleaning the project. Compiler being like "What the fuck is 'void'?"

Or - I know you didnt make any changes, but Im gonna build AppCode folder anyway... Its only gonna take a minute or two, no worries.

Or - You have XML template file to this class (codebehind)? You wanna open the XML? Would be shame if it was opened in the designer view and your entire IDE crashed 'cuz of some unsuported third party UI element.

Or - just unexpected debug session crashes.

And dont make me start on Xamarin...