How to set multiple startup projects in Visual Studio?

Visual Studio allows you to specify how more than one project is run when you start the debugger. To set multiple startup projects

1. In Solution Explorer, select the solution (the top node).

2. Choose the solution node's context (right-click) menu and then choose Properties. The Solution Property Pages dialog box appears.

3. Expand the Common Properties node, and choose Startup Project.

4. Choose the Multiple Startup Projects option and set the appropriate actions.

Having multiple startup projects in one solution, such as one is the client and the other is the server, enable you debug and trace both projects at same time.