I was studying for .NET 4 exam and running through one of the lab sessions and it needed me to add a button and dropdown box but then suddenly the toolbox was not coming up.
I was searching around and couldn’t find out how to add it back in, I also couldn’t understand where it would be.
Finally I found out how to add the toolbox back in.
Go to the VIEW menu
Click on Toolbox
then once again you can enjoy adding buttons and dropdowns to your hearts content