how to run multiple projects in visual studio simultaneously

Question

I am trying to get my main project and my API to run along side each other in Visual Studio 2015. The method that usually works is: start my main project, then right-click on API project, go to Debug, select Start New Instance. But that doesn't always work. It sometimes crashes on me with an exception saying: "Value cannot be null. Parameter name: httpContext".

What is the proper procedure for running more than one project at once from the same Visual Studio instance?

Answer 1

Assuming that both your projects are in the same solution: right click the Solution, click "Set Startup Projects", then select "Multiple Startup Projects" and indicate the ones you want to start when you click "Run".

Good luck!