To display the This window
Using the This window, you can examine the data members of the object associated with the current method (called this in C++ and C# or Me in Visual Basic).
To modify the value of a variable in the This window
Caution Editing floating-point values can result in minor inaccuracies due to decimal-to-binary conversion of fractional components. Even a seemingly innocuous edit can result in changes to some of the least significant bits in the floating-point variable.