Visual Studio /**/ comment shortcut?

Visual studio comment shortcut key: Accept in HTML, C#, JS, CSS etc in Visual studio.

Ctrl + k then Ctrl + c

//a
//b                      
//c

to undo ctrl + k then Ctrl + u

a
b
c

Ctrl + Shift + /

/*a
b
c*/

to undo Ctrl + Shift + /

a
b
c

I think there is no shortcut key for this purpose in Visual Studio but If you use ReSharper you can use Ctrl + Shift + /.

Have a look at this may be useful as well.