Asp. NET multiple controls share the same event, the use of sender

When multiple controls share the same event, it is also necessary to differentiate between events by the sender parameter in the control event when the control is clicked. The RadioButton method is to define the variables of the control in the event, such as the public event of the control RadioButton radbtn = (RadioButton) sender; This allows you to differentiate between the control's triggering event by defining the control variable. The ID property of the triggering event control can be taken as radbtn.id.

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Asp. NET multiple controls share the same event, the use of sender