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Factorial

Write a method named Factorial that accepts an integer n as a parameter and returns the Factorial of n, or n!. A Factorial of an integer is defined as the product of all integers from 1 through that integer inclusive. For example, the call of Factorial(4) should return 1 * 2 * 3 * 4, or 24. The Factorial of 0 and 1 are defined to be 1. You may assume that the value passed is non-negative and that its Factorial can fit in the range of type int.

Method: Write a C# method as described, not a complete program or class.

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