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If you have a file open in the code editor, you can set a breakpoint by clicking in the margin to the left of a line of code. A breakpoint indicates where Visual Studio should suspend your running code so you can take a look at the values of variables, or the behavior of memory, or whether or not a branch of code is getting run. Breakpoints are the most basic and essential feature of reliable debugging. However, right now you may not have set any breakpoints to examine your app code, so we will do that first and then start debugging. F5 ( Debug > Start Debugging) is the most common way to do that. To debug, you need to start your app with the debugger attached to the app process. For more information on the different types of breakpoints, such as conditional breakpoints and function breakpoints, see Using breakpoints. Set a breakpoint and start the debuggerīreakpoints are a useful feature when you know the line of code or the section of code that you want to examine in detail at runtime.
The features described here are applicable to C#, C++, Visual Basic, JavaScript, and other languages supported by Visual Studio (except where noted). If this is the first time that you've tried to debug code, you may want to read Debugging for absolute beginners before going through this topic. You can step through your code and look at the values stored in variables, you can set watches on variables to see when values change, you can examine the execution path of your code, et al.
When you do this, the debugger provides many ways to see what your code is doing while it runs. In the Visual Studio context, when you debug your app, it usually means that you are running the application with the debugger attached (that is, in debugger mode). This topic introduces the debugger tools provided by Visual Studio.