Property validation logic in C Sharp (C#) - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to declare a property with a private setter.

C Sharp (C#)

public class Person {
    public string Name { get; [1] }
}

Drag options to blanks, or click blank then click option'

Aprivate set

Bset

Cget set

Dinit

Attempts:

3 left

💡 Hint

Common Mistakes

Using just 'set' makes the setter public.

Using 'get set' allows public setting.

Using 'init' allows setting only during object initialization.

The property setter is made private by using private set, so it can only be set inside the class.

2fill in blank

medium

Complete the code to validate the Age property so it cannot be set below 0.

C Sharp (C#)

private int age;
public int Age {
    get { return age; }
    set {
        if ([1] < 0) throw new ArgumentException("Age cannot be negative");
        age = value;
    }
}

Drag options to blanks, or click blank then click option'

Athis.age

Bage

Cvalue

DAge

Attempts:

3 left

💡 Hint

Common Mistakes

Using the field name instead of 'value' in the condition.

Using the property name inside its own setter causes recursion.

The value keyword represents the value being assigned to the property. We check if it is less than 0.

3fill in blank

hard

Fix the error in the property setter to correctly validate and assign the value.

C Sharp (C#)

private string email;
public string Email {
    get { return email; }
    set {
        if (!value.Contains("@"))
            throw new ArgumentException("Invalid email");
        [1] = value;
    }
}

Drag options to blanks, or click blank then click option'

AEmail

Bemail

Cvalue

Dthis.Email

Attempts:

3 left

💡 Hint

Common Mistakes

Assigning to the property inside its own setter causes infinite recursion.

Assigning to 'value' is invalid.

The private field email should be assigned the new value, not the property itself, to avoid infinite recursion.

4fill in blank

hard

Fill both blanks to create a property that validates the Score is between 0 and 100.

C Sharp (C#)

private int score;
public int Score {
    get { return score; }
    set {
        if ([1] < 0 || [2] > 100)
            throw new ArgumentOutOfRangeException("Score must be 0-100");
        score = value;
    }
}

Drag options to blanks, or click blank then click option'

Avalue

Bscore

Attempts:

3 left

💡 Hint

Common Mistakes

Using the field name instead of 'value' in the condition.

Checking the wrong variable for the range.

We check the new value being assigned (value) to ensure it is within the valid range.

5fill in blank

hard

Fill all three blanks to create a property with a backing field that validates non-empty strings and trims whitespace.

C Sharp (C#)

private string name;
public string Name {
    get { return name; }
    set {
        if (string.IsNullOrWhiteSpace([1]))
            throw new ArgumentException("Name cannot be empty");
        name = [2].Trim();
        Console.WriteLine($"Name set to: [3]", name);
    }
}

Drag options to blanks, or click blank then click option'

Avalue

Cname

Attempts:

3 left

💡 Hint

Common Mistakes

Using the property name inside its own setter causing recursion.

Using the wrong variable in the Console.WriteLine.

The setter uses value to check and trim the input. The name field is used in the console output.