| ServiceProvider | Provides a simple implementation of IServiceProvider that provides a mechanism for retrieving a service object; that is, an object that provides custom support to other objects. |
| TypeDescriptorContext | Provides a simple implementation of ITypeDescriptorContext interface that defines contextual information about a Component, such as its IContainer and PropertyDescriptor. |
| WindowsFormsEditorService | Provides an implementation of IWindowsFormsEditorService interface for a UITypeEditor to display Windows Forms or to display a control in a drop-down area from a property grid control in design mode or runtime mode. |