How to add multiple projects in a single solution in Visual Studio 2008 ?

When you create new web project or website using Visual studio 2008, you might be not able to add multiple project in a solution, the reason is you are not able to see the solution icon in solutions window.

Please do as the following steps:

In VS 2008, clicking Tools –> Options –> “Projects and Solutions” General property page and checking “Always show solution”.

Should be OK now.