A struct type is a value type that is typically used to encapsulate small groups of related variables, such as the coordinates of a rectangle or the characteristics of an item in an inventory. The following example shows a simple struct declaration:
public struct Book
{
public decimal price;
public string title;
public string author;
}
Structs can also contain constructors, constants, fields, methods, properties, indexers, operators, events, and nested types, although if several such members are required, you should consider making your type a class instead.
Structs can implement an interface but they cannot inherit from another struct. For that reason, struct members cannot be declared as protected.
For more information, see Structs (C# Programming Guide).
C# Language Specification
For more information, see the following sections in the C# Language Specification:
Concepts
Reference
Other Resources