When we create a new C#.Net project (or other .Net project, , the editor includes the following using statements in the code
using System; using System.Collections.Generic; using System.ComponentModel; using System.Data; using System.Drawing; using System.Linq; using System.Text; using System.Windows.Forms;
But most of this included namespaces are unused, and you don't know which of them you don't need.
So, in Visual Studio 2008 there is a new feature for excluding the unused usings from your project.
In the code editor, click the right mouse button and in the context menu go to Organize Usings -> Remove and Sort

If you have not written additional code, the editor will leave this two using statements
using System; using System.Windows.Forms;
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