It is a very common requirement to add a folder and all files in it, under a solution in Visual Studio 2010. So here’s a small guide on how to do it.

Procedure to be followed :
1. Select the “Show All Files” option.

2. Right click on the folder you want to include in the solution

3. Select the “Include in project” option. And the folder is included in your solution

That’s it ! Hope this helps :)