Occurs when the ComboBox.SelectedIndex property has changed.
You can create an event handler for this event to determine when the selected index in the System.Windows.Forms.ComboBox has been changed. This can be useful when you need to display information in other controls based on the current selection in the System.Windows.Forms.ComboBox. You can use the event handler for this event to load the information in the other controls.
For more information about handling events, see Consuming Events.