Is there a shortcut for Duplicate Line command in Visual Studio 2008?
Some similar examples:
For visual studio 2010, try using these commands for quick line duplication (uses clipboard):
Click on the line you want to copy. Ctrl + C will copy that line.
Then press Ctrl + Shift + Enter to insert a blank below insertion point
(Alternatively use Ctrl + Enter to insert a blank line above the insertion point.)
Then simply use Ctrl + V to paste the line.