AboutPAC-MAN12 min read. What happens when you build a .NET app? What happens the instant you run it? The last time I studied this was when .NET Framework was in its infancy. That was nearly 20 years ago! Things have changed in those two decades: apps are now cross-platform; .NET has lost its "Framework" moniker; and I've lost my hair! This post looks at:what's in a modern .NET 5 (C#) projectwhat's generated when you buildwhat happens when you run it We won't go into a massive amount of detail, but ...