Properties vs fields in C Sharp (C#) - Quick Revision & Key Differences

Recall & Review

beginner

What is a field in C#?

A field is a variable declared directly in a class or struct to store data. It holds the actual data for an object.

beginner

What is a property in C#?

A property is a member that provides controlled access to a field, usually with get and set accessors to read or write the value.

intermediate

Why use properties instead of fields?

Properties allow validation, encapsulation, and control over how data is accessed or changed, unlike fields which are accessed directly.

beginner

Show a simple example of a property with a private field in C#.

private int age; public int Age { get { return age; } set { if (value >= 0) age = value; } }

intermediate

What is an auto-implemented property?

An auto-implemented property lets you declare a property without explicitly defining a backing field; the compiler creates it automatically.

Which of the following is true about fields in C#?

A Fields store data directly and are usually private.

B Fields provide controlled access with get and set methods.

C Fields are only used in interfaces.

D Fields cannot hold values.

Fields are variables inside classes or structs that hold data directly, often marked private to protect data.

What does a property in C# typically include?

A Get and set accessors to control access to data.

B Only a variable declaration.

C A method that returns void.

D A constructor.

Properties usually have get and set accessors to read and write values with control.

Why might you prefer a property over a public field?

A Properties cannot be accessed outside the class.

B Properties are slower and less secure.

C Fields can only be used in static classes.

D Properties allow adding validation logic when setting values.

Properties let you add checks or other logic when values are read or changed, improving safety.

What is an auto-implemented property?

A A property that cannot be changed after creation.

B A property with no get or set accessors.

C A property where the compiler creates the backing field automatically.

D A property that is only readable.

Auto-implemented properties let you write less code by not declaring the backing field explicitly.

Which keyword is used to define a property in C#?

A field

B get/set

C property

D class

Properties use get and set keywords to define accessors.

Explain the difference between a field and a property in C#.

Think about how you store data and how you control reading or writing it.

Describe why properties are preferred over public fields in object-oriented programming.

Consider how you keep data safe and flexible.