Maybe I was just spoiled in MS Access with the AfterUpdate event which fired after a person left the control (either using tab, enter, or clicking elsewhere), but it seems like there should be some equivalent in C#. I see ways to accomplish this same task, but it seems like a lot of work for something that would be so commonly used in people's programs. I could create a custom combobox and override the KeyPress field to cause validation when the person hits enter, and then use the controls Validated event as a sort of AfterUpdate, but isn't this a common enough scenario to have been included in the Combobox, ListBox, and TextBox class? For example: EnterCausesValidation or EnterTabsFromControl bool properties?