Occurs when the form is activated in code or by the user.
Assembly: System.Windows.Forms (in System.Windows.Forms.dll)
When the application is active and has multiple forms, the active form is the form with the input focus. A form that is not visible cannot be the active form. The simplest way to activate a visible form is to click it or use an appropriate keyboard combination.
To activate a form at run time using code, call the Activate method. You can use this event for tasks such as updating the contents of the form based on changes made to the form's data when the form was not activated.
For more information about handling events, see Consuming Events.
The following code example demonstrates how to use the SetDesktopLocation, Closed, Load, , and Activate members. To run the example, paste the following code in a form called Form1 containing a Button called Button1 and two Label controls called Label1 and Label2.