[Solved] Consider this class with nested validation:class Employee { private string _id; public string Id { get => _id; set { if (string.... } } }What happens if you assign " " (two spaces) to Id? | C Sharp (C#)

C Sharp (C#) - Properties and Encapsulation

Consider this class with nested validation:

class Employee {
  private string _id;
  public string Id {
    get => _id;
    set {
      if (string.IsNullOrWhiteSpace(value)) throw new ArgumentException("Id required");
      if (value.Length != 5) throw new ArgumentException("Id must be 5 chars");
      _id = value;
    }
  }
}

What happens if you assign " " (two spaces) to Id?

AThrows ArgumentException with message "Id must be 5 chars"

BThrows ArgumentException with message "Id required"

CSets _id to " " without error

DCompilation error due to string validation

Step-by-Step Solution

Solution:

Step 1: Understand string.IsNullOrWhiteSpace behavior
It returns true for strings that are null, empty, or whitespace only.
Step 2: Evaluate the assigned value
" " is whitespace only, so first condition throws "Id required" exception.
Final Answer:
Throws ArgumentException with message "Id required" -> Option B
Quick Check:
Whitespace triggers first validation exception [OK]

Quick Trick: string.IsNullOrWhiteSpace catches empty or spaces [OK]

Common Mistakes:

MISTAKES

Assuming whitespace passes validation
Expecting second condition to trigger first
Confusing compile-time and runtime errors

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More C Sharp (C#) Quizzes

Consider this class with nested validation:

Step 1: Understand string.IsNullOrWhiteSpace behavior

Step 2: Evaluate the assigned value

Final Answer:

Quick Check:

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