In eclipse there is a shortcut Ctrl+Shift+F that re-indents code and fixes comments and blank lines. Is there an equivalent for Visual Studio 2010?
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 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 the 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.
(Please do not edit this answer to change the key bindings above to what your system has!)