Cast int to Enum in C#

What's a quick and easy way to cast an int to an enum in c#?

Why is the C# "as' operator so popular?

In development blogs, online code examples and (recently) even a book, I keep stumbling about code like this:

How to cast variable to array

I have a variable $v that can be either single string or array of strings

Is there any runtime cost for Casting in Java?

Would there be any performance differences between these two chunks?

public void doSomething(Supertype input)

{

    Subtype foo = (Subtype)input;

    foo.methodA();

    foo.methodB();

}

get ascii code from string in xcode for iphone app

hey just a couple quick noob questions about writing my first ios app. Ive been searching through the questions here but they all seem to address questions more advanced than mine so im getting confused.