this is basically a tutorial question to ask since am a beginner I would like to what is a difference between the using statement we use at start of our C# code to include a
I'm sure someone will spend a great deal of time answering what amounts to a Google search but here are a couple of links to get you started.
The using Statement (C# Reference) ensures that Dispose is called even if an exception occurs while you are calling methods on the object.
To allow the use of types in a namespace so that you do not have to qualify the use of a type in that namespace use using Directive (C# Reference).
You may find that MSDN is a great resource to spend some time browsing.