If nothing is selected, Ctrl + D will duplicate the line the cursor is in and insert it right below the line in focus. If you’d like to duplicate a specific set of code, simply select the portion of code you want to duplicate before invoking the duplicate code command. 

How do I duplicate a line below in Visual Studio?

As @cand mentioned, you can just do Ctrl + C ; Ctrl + V . Ctrl + C will copy the line if nothing is selected.

How do I duplicate a line of code in Visual Studio 2022?

The chord Ctrl then – E + V duplicates a line.
 

How do you duplicate a code line?

Quote from video: All right so we have a line of code here on line one where we are importing. The react library and the component. Parts of the react library from react not really important what we're doing let's just

How do you duplicate a line in VS code quickly?

Now we can use these Vim-friendly commands in VSCode!

1. Alt + J to move a line down.
2. Alt + K to move a line up.
3. Shift + Alt + J to duplicate a line down.
4. Shift + Alt + K to duplicate a line up.

How do you copy a horizontal line?

Quote from video:

How do you copy a line below?

When previously using atom, placing the cursor at the end of the line and pressing Ctrl+C would copy that line. Placing the cursor at the end of another line and pressing Ctrl+V would paste it below that line.