C# Programming/Keywords/volatile

The volatile keyword is used to declare a variable that may change its value over time due to modification by an outside process, the system hardware, or another concurrently running thread.

You should use this modifier in your member variable declaration to ensure that whenever the value is read, you are always getting the most recent (up-to-date) value of the variable.

class MyClass
{
  public volatile long systemclock;
}

C# Keywords
abstract as base bool break byte case catch char checked class const continue decimal default delegate do double else enum event explicit extern false finally fixed float for foreach goto if implicit in int interface internal is lock long namespace new null object operator out override params private protected public readonly ref return sbyte sealed short sizeof stackalloc static string struct switch this throw true try typeof uint ulong unchecked unsafe ushort using var virtual void volatile while
Special C# Identifiers (Contextual Keywords)
add alias async await dynamic get global nameof partial remove set value when where yield
Contextual Keywords (Used in Queries)
ascending by descending equals from group in into join let on orderby select where

This keyword has been part of the C# programming language since .NET Framework 1.1 (Visual Studio 2003).