This new feature, which isn’t limited to Windows Forms, allows a single class to extend across multiple files, isn’t limited to Windows Forms but the designer-generated code is just screaming out for a solution like this.

Jay writes:

<span deactivatedstyle="FONT-FAMILY: Tahoma"> <b> <a id="viewpost.ascx_TitleUrl" href="http://blogs.msdn.com/jaybaz_ms/archive/2004/04/28/122392.aspx">Winforms designed code and C# partial classes</a> </b> </span>