How to create an array of form input posts in C#?

Hi, I would like to create an array that holds all of the form field's input in C#.  In php I would do something like this:

$required_fields = array();
			foreach($_POST as $key => $value){
			$required_fields[] = $key;
		}

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I can't figure out what to do in C# though.  Anyone know how to go about this?