Debugging an application called from another in Visual Studio?

Question

I have a lobby application which invokes a client-application (think: League of Legends). They're two separate applications and the first invokes the second from itself - how can I get Visual Studio to debug this application as well?

Answer 1

You simply need to launch a separate Visual Studio, and then use Debug | Attach to Process to attach to the other process. The trick is using two Visual Studios.

Answer 2

Debug -> Attach to process

Select the executable from the list.

Make sure to select the right code type with the Select.. button.