void (C# Reference)

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When used as the return type for a method, void specifies that the method doesn't return a value.

void isn't allowed in the parameter list of a method. A method that takes no parameters and returns no value is declared as follows:

public void SampleMethod()
{
    // Body of the method.
}

void is also used in an unsafe context to declare a pointer to an unknown type. For more information, see Pointer types.

void is an alias for the .NET Framework Void type.

C# Language Specification

For more information, see the C# Language Specification. The language specification is the definitive source for C# syntax and usage.