Please Help: VB to C#

The event models are the same throughout .NET. Just click on the control, then click the lightening bolt on the properties window, and you'll see the list of events. Double click one of them and your event proc is created for you by the IDE.

Lost_Focus is the event in VB. Ex: TextBox_LostFocus(). It'll call automatically when the focus is lost from Text Box. Thanks & Regards, Ashish

LostFocus. What do you mean by "define it"?