When used as the return type for a method, void specifies that the method does not return a value.
void is not allowed in a method's parameter list. A method that takes no parameters and returns no value is declared as follows:
void SampleMethod();
void is also used in an unsafe context to declare a pointer to an unknown type. For more information, see Pointer types (C# Programming Guide).
void is an alias for the .NET Framework System.Void type.
For more information, see the following sections in the C# Language Specification:
1.6.5 Methods