In VS if you hover your mouse over this variable, you'll notice it displays it's value in a tooltip. You can click into this tooltip and edit it manually - though you need to provide a value of the correct format for the data type. Strings also need quotes "".
There is likely a way to do this via some of the other debugging windows, but I don't know of any. I'll leave those answers to someone else.
与恶龙缠斗过久,自身亦成为恶龙;凝视深渊过久,深渊将回以凝视…