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The fixed keyword is used to prevent the garbage collector from relocating a variable. You may only use this in an unsafe context.

fixed (int *c = &shape.color) {
  *c = Color.White; 
}

If you are using C# 2.0 or greater, the fixed may also be used to declare a fixed-size array. This is useful when creating code that works with a COM project or DLL.

Your array must be composed of one of the primitive types: bool, byte, char, double, float, int, long, sbyte, short, ulong, or ushort.

protected fixed int monthDays[12];

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`

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