After installing a recent version of Visual Studio, pressing the shift-quote doesn’t type a double quote until you hit it a second time, at which point two double quotes are typed.  Here’s how to be able to type a single double-quote like a normal person with each key press.

How to fix: In Visual Studio, go to TOOLS –> Options –> Environment –> International Settings, change the Language to “Same as Microsoft Windows”.  Hit ok and restart Visual Studio.

Make sure your Windows settings are set correctly: Control Panel –> Region and Language –> Keyboards and Languages –> Change Keyboards…   Set Default Input Language to “English (United States) – US” (Not “English (United States) – United States-International”) .  Hit ok and restart Visual Studio.