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Why is it important to place validation logic before assigning the value to the backing field in a property setter?

hard🧠 Conceptual Q10 of 15
C Sharp (C#) - Properties and Encapsulation
Why is it important to place validation logic before assigning the value to the backing field in a property setter?
ATo enable automatic property generation
BTo prevent invalid data from being stored in the field
CTo allow the setter to return a value
DTo improve the speed of property access
Step-by-Step Solution
Solution:
  1. Step 1: Understand the purpose of validation order

    Validation must happen before assignment to avoid storing bad data.
  2. Step 2: Identify consequences of wrong order

    If assignment happens first, invalid data could be stored before exception is thrown.
  3. Final Answer:

    To prevent invalid data from being stored in the field -> Option B
  4. Quick Check:

    Validate before assign to protect data integrity [OK]
Quick Trick: Validate first, then assign to keep data clean [OK]
Common Mistakes:
MISTAKES
  • Assigning before validation allowing bad data
  • Thinking validation improves speed
  • Expecting setters to return values

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