4.Exception Handling and Best Practices - aniketmulmule/web_Project GitHub Wiki

Here's a deep dive into Exception Handling in C#, along with interview-focused insights for a senior .NET developer with 8+ years of experience.

✅ 1. What Is Exception Handling in C#?

Exception handling is the process of responding to run-time errors in a structured and predictable way using:

  • try

  • catch

  • finally

  • throw

try
{
    var result = 10 / divisor;
}
catch (DivideByZeroException ex)
{
    Console.WriteLine("Cannot divide by zero.");
}
finally
{
    Cleanup();
}

✅ 2. Common Exception Types (Know These)

Exception When It Occurs
NullReferenceException Accessing a null object
ArgumentNullException Passing null to a method that doesn’t allow it
InvalidOperationException Method call is invalid for the object's state
FormatException Invalid type formatting (int.Parse("abc"))
IndexOutOfRangeException Invalid index in an array or list
IOException / FileNotFoundException File system operations fail
SqlException SQL Server-related error

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