What is the difference between "object as type" and "((type)object)"? [duplicate]

Question

Possible Duplicate:
Direct casting vs 'as' operator?
Casting vs using the 'as' keyword in the CLR

object myObject = "Hello world.";
var myString = myObject as string;

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object myObject = "Hello world.";
var myString = (string)myObject;

I have seen type conversion done both ways. What is the difference?

Answer 1

"as" will set the result to null if it fails.

Explicit cast will throw an exception if it fails.