Remove EditorWindow Warning

I want to extend the functionality of unity editor, so I just follow the rules of the documentation:

Code (CSharp):

1. public class HelloWorldWindow : EditorWindow
2. {
3.     string    myString = "Hello World";
4.     bool    groupEnabled;
5.     bool    myBool = true;
6.     float    myFloat = 1.23f;
7.  
8.     [MenuItem ("Window/HelloWorld")]
9.  
10.     static void Init()
11.     {
12.         HelloWorldWindow window = (HelloWorldWindow)EditorWindow.GetWindow(typeof(HelloWorldWindow));
13.     }
14.  
15.     void OnGUI()
16.     {
17.         ...
18.     }
19. }

After editing this C# class, I got my new class file compiled, yet I got a warning from the compiler:
"warning CS0219: The variable `window' is assigned but its value is never used"

So is there anybody know how to get rid of this warning?

Since I'm new to C# (I used to use C++), this piece of code seems magic to me, because I can see the variable "window" be used nowhere, could anybody please explain how this window guy works behind the scene?

 

Code (CSharp):

1.     static void Init()
2.     {
3.         HelloWorldWindow window = (HelloWorldWindow)EditorWindow.GetWindow(typeof(HelloWorldWindow));
4.     }

Right there

 

Thanks, Nubz. I figured out that I can replace that line of code to

Code (CSharp):

1. EditorWindow.GetWindow(typeof(HelloWorldWindow));

So actually Unity3D does not use the variable "window" that I declared in Init() method.