Gets or sets a value indicating whether the control causes validation to be performed on any controls that require validation when it receives focus.
Assembly: System.Windows.Forms (in System.Windows.Forms.dll)
The following code example uses the derived class TextBox and validates an e-mail address that the user enters. If the e-mail address is not in the standard format (containing "@" and "."), the validation fails, an ErrorProvider icon is displayed, and the event is canceled. One of the buttons on the form has its property set to false. Clicking or setting focus to this button does not trigger validation. This example requires that a TextBox, an ErrorProvider control, and a Button have been created on a form.
Windows 8.1, Windows Server 2012 R2, Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)