How do I open a Visual Studio project in design view?

I saved my project, but now I can't open it up in design view where you see all the buttons and stuff. Visual Studio 2012 Anyone know how?

You can double click directly on the .cs file representing your form in the Solution Explorer :

This will open Form1.cs [Design], which contains the drag&drop controls.

If you are directly in the code behind (The file named Form1.cs, without "[Design]"), you can press Shift + F7 (or only F7 depending on the project type) instead to open it.

From the design view, you can switch back to the Code Behind by pressing F7.