Tip 7.24: You can use DataTips to edit a variable’s content

“Visual Studio Tips, 251 ways to improve your Productivity in Visual Studio“, courtesy of ‘Sara Ford’

Sara Ford’s Weblog

Whenever you are debugging and want to change the contents of a variable, you can drag the variable into the Watch window. But you can also use DataTips to change the variable without leaving the editor.
Hover over a variable when you have hit a breakpoint. You’ll notice a glorified ToolTip appear. This is actually a DataTip. You can click the value of the variable to go into an edit mode. Change the contents of the variable, and press Enter to commit.

If you have the Autos window open, you’ll notice the color change, implying the commit was successful.