When debugging in Visual Studio you can see the local variables for the current function that is running in the Locals window. You can also watch specific variables by right clicking them and clicking Add Watch.

when debugging code which's called recursively many times, sometimes it gets difficult to realize which execution of the code you are seeing. Is there any IDE graphic tool which helps to see that with diagrams or something?

To display method calls in Visual Studio, you can use static analysis tools to display the internal calls. Here are several official documents for your reference: Document 1 (A static analysis tool that displays the calling relationships in the code rather than all the paths actually executed during debugging.)

The Visual Studio debugger can help you navigate through code to inspect the state of an app and show its execution flow, which is also known as code stepping. You can use keyboard shortcuts, debug commands, breakpoints, and other features to quickly get to the code you want to examine.

Debugging Recursive Code. To debug recursive code, you should first turn reuse of bubbles off. See Turning Reuse of bubbles on or off. Then all you need to do is start debugging, and your recursive calls will be shown in individual bubbles such as this: Figure 5.