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Almost all C# files have using statements at the top of the page
i.e.
using System;
using System.IO;
//code....
What do the using statements mean that are at the top of the page? Why is the syntax different from other using statement declarations.
i.e.
using (ResourceType resource = expression) statement
Those are using directives. They tell the compiler which namespaces to look in to find the classes you use in your code.
They look different (and are completely different) from the using statement which defines a scope for disposable objects.