Is it possible to change the value of a variable during execution time?

You can do this as follows:
1. Put a breakpoint just after the line of code where you want to update the varaible value.
2. Run the application till the breakpoint is hit.
3. Just hover over the variable you want to edit and the varable name and value will be shown.
4. Click on the Value field and edit it, press enter.

Mission accomplished...