Is there a format code shortcut for Visual Studio?

Visual Studio with C# key bindings

To answer the specific question, in C# you are likely to be using the C# keyboard mapping scheme, which will use these hotkeys by default:

Ctrl+E, Ctrl+D to format the entire document.

Ctrl+E, Ctrl+F to format the selection.

You can change these in menu Tools → Options → Environment → Keyboard (either by selecting a different "keyboard mapping scheme", or binding individual keys to the commands "Edit.FormatDocument" and "Edit.FormatSelection").

If you have not chosen to use the C# keyboard mapping scheme, then you may find the key shortcuts are different. For example, if you are not using the C# bindings, the keys are likely to be:

Ctrl + K + D (Entire document)

Ctrl + K + F (Selection only)

To find out which key bindings apply in your copy of Visual Studio, look in menu Edit → Advanced menu - the keys are displayed to the right of the menu items, so it's easy to discover what they are on your system.

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_{(Please do not edit this answer to change the key bindings above to what your system has!)}

Ctrl + K + D (Entire document)

Ctrl + K + F (Selection only)

Try Ctrl + K + D (don't lift the Ctrl key in between).