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When a user is tabbing fast through a dialog entering data, they are sometimes going to get it wrong. When we do get it wrong, however, we don't want to be bugged about it.
The last thing we need is for a Message Box to pop up when we tab away from a field, telling us it's invalid. Also, we don't want all the validation done when the user presses the OK button, because they could then potentially be given a great big message with all the fields that are wrong.
Great Windows applications have a consistent user interface.
As the user learns how to work with one form in the application, the user can leverage that knowledge as they work with other forms in the application.
She is on the INETA Speaker’s Bureau, is a well-known speaker at technical conferences, and is a Microsoft Most Valuable Professional (MVP).Data input validation in Windows Forms is essential.Built-in validation doesn't go much further than an enforcable maximum length for textboxes, but there are some nice methods you can use to make validation a breeze.My Dear Martin, Allan, Veena and All Member, Happy new year to all of u. But When I am working on Text Box Control with Got Foucs and Lost Focus Event it is giving problem in VB. I am sending VB6 Code blow which in on single form with two text boxes.