In this short tutorial, you will learn the key points of C# constants.

Definition

A constant is a variable whose value cannot be changed throughout its lifetime, and it is defined with the keyword const.

const string testStr = "This is a constant";

Characteristics

• Constants must be initialized when they are declared. And can never be overwritten after a value been assigned.
• The value of a constant must be computable at compile time. As the compiler replaces the variable with its values everywhere it is used.
• Constants are always implicitly static.