What are user-defined data types in C#?

In C#, user-defined data types are structures and enumerations.

Structure

In C#, a structure is a value type data type. It helps you make a single variable hold related data of various data types. Use the struct keyword to create structures.

C# structures have the following characteristics:

• Structures can have methods, fields, indexers, properties, operator methods, and events.
• Structures can have defined constructors, but no destructors. However, you cannot define a default constructor for a structure. The default constructor is automatically defined and cannot be changed.
• Unlike classes, structures cannot inherit other structures or classes.
• Structures cannot be used as the basis for other structures or classes.
• A structure can implement one or more interfaces.
• Structure members cannot be designated as abstract, virtual, or protected.

Enumeration

An enumeration is an enumeration used to store a set of named constants, such as year, product, month, season, etc.

The default value of enumeration constants starts from 0 and increases. It has a fixed set of constants and can be easily traversed.

Let's look at an example.

We set up the following enumeration:

public enum Vehicle { Car, Bus, Truck }

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