System.ComponentModel.ToolboxItemFilterAttribute provides a mechanism by which toolbox items can be marked for use only with designers that have a matching attribute or code that determines whether the item should be enabled or disabled in the toolbox.

A System.ComponentModel.ToolboxItemFilterAttribute can be applied to a System.Drawing.Design.ToolboxItem to indicate a filter string and filter type that specify when to enable or disable the item. System.ComponentModel.ToolboxItemFilterAttribute can also be applied to a designer to indicate its requirements for enabling items in the toolbox. This type of attribute can be used to indicate that a toolbox item can only be enabled when a designer with a matching filter string is being used. The type of the filter is indicated in the ToolboxItemFilterAttribute.FilterType property by a System.ComponentModel.ToolboxItemFilterType that indicates whether and how a filter string match is used, or whether to use custom code to determine whether to enable an item.