Keywords are predefined, reserved identifiers that have special meanings to the compiler.
They cannot be used as identifiers in your program unless they include@ as a prefix.
For example,@ if is a valid identifier but if is not because if is a keyword.
The first table in this topic lists keywords that are reserved identifiers in any part of a C# program.
The second table in this topic lists the contextual keywords in C#.
Contextual keywords have special meaning only in a limited program context and can be used as identifiers outside that context.
Generally, as new keywords are added to the C# language, they are added as contextual keywords in order to avoid breaking programs written in earlier versions.

A contextual keyword is used to provide a specific meaning in the code, but it is not a reserved word in C#.
Some contextual keywords, such as partial and where, have special meanings in two or more contexts.

Reserved and Contextual Keywords in c#

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