Bits of .NET

Hardcoded property names break on refactoring. nameof() generates string from code symbol safely.

❌ Magic String (Breaks on Rename):

public class User
{
    public string Name { get; set; }
}

// Later in code:
if (propertyName == "Name")  // Typo-prone, breaks if User.Name renamed!

✅ nameof (Refactor-Safe):

if (propertyName == nameof(User.Name))  // Compile-time checked!
// If User.Name renamed, this automatically updates!

Use Cases: INotifyPropertyChanged, exception messages, logging, validation

throw new ArgumentNullException(nameof(user));
_logger.LogInfo($"{nameof(SaveUser)} called");