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Debugging in C#

Debugging is the process of identifying, analyzing, and fixing errors (bugs) in a program.
In C#, debugging is an essential skill to ensure code quality and stability.

Debugging Techniques in C#​

  • Using Console.WriteLine

    • One of the simplest and most common techniques involves printing values to the console to verify the state of variables at different points in the program.

  • Breakpoints

    • With Visual Studio or Visual Studio Code, you can pause execution on specific lines to inspect the program's state.

  • Step-by-step Execution (Stepping)

    • Allows advancing line by line in the code, observing how variables and the execution flow change.

  • Variable Inspection

    • During debugging, you can view the current values of variables and modify their content in real-time.

Tools for Identifying and Fixing Errors​

  • Visual Studio Debugger
    Offers a built-in debugger with support for breakpoints, variable inspection, call stack, and expression evaluation.

  • Visual Studio Code + Extensions
    With the C# extension, it allows step-by-step debugging and variable exploration.

  • Logs and Traces

    • Implementing logs via Console.WriteLine or libraries like Serilog to analyze the system's behavior during execution.

Practical Debugging Exercises​

  1. Detect logical errors

    • Write a program that calculates the average of a list of numbers and introduce an error on purpose (e.g., dividing by the wrong quantity).
    • Debug to identify the error.

  2. Use of breakpoints

    • Create a program that loops over an array.
    • Place a breakpoint inside the loop and observe how values change in each iteration.

  3. Exception Inspection

    • Handle errors with try-catch and use the debugger to view the program flow when an exception occurs.