C# Academy · Lesson

try/catch/finally, throw new vs rethrow

Use try/catch/finally for predictable error handling; understand throw new vs rethrow; keep examples small and focused.

Exceptions overview

Goal: Handle and propagate errors safely.

try/catch: handle specific exceptions
finally: always runs for cleanup
throw new vs rethrow
Keep handlers short; do not hide bugs

Specific catch

Catch the most specific exception you expect; keep the handler short and clear.

using System;

public class Program
{
  public static void Main(string[] args)
  {
    Console.WriteLine("Start");
    try
    {
      int x = 10;
      int y = 0; // will cause DivideByZeroException
      Console.WriteLine(x / y);
    }
    catch (DivideByZeroException ex)
    {
      Console.WriteLine("Cannot divide by zero: " + ex.GetType().Name);
    }
    Console.WriteLine("Continue");
  }
}

All lessons in this course

try/catch/finally, throw new vs rethrow
Custom exceptions; error design
IDisposable, using statement

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