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Connecting Multiple Events to a Single Event Handler in Windows Forms

Visual Studio .NET 2003

In your application design, you may find it necessary to have a single event handler used for multiple events or the multiple events fire the same procedure. For example, it is often a powerful time-saver to have a menu command fire the same event as a button on your form does if they expose the same functionality. You can do this by using the Events view of the Properties window in C# or using the Handles keyword and the Class Name and Method Name drop-down boxes in the Visual Basic Code Editor.

To connect multiple events to a single event handler in Visual Basic

  1. Right-click the form and choose View Code.
  2. From the Class Name drop-down box, select one of the controls that you want to have the event handler handle.
  3. From the Method Name drop-down box, select one of the events that you want the event handler to handle.
  4. The Code Editor inserts the appropriate event handler and positions the insertion point within the method. In the example below, it is the Click event for the Button control.
    ' Visual Basic
    Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
    'Add Event Handler Code Here
    End Sub
    
  5. Append the other events you would like handled to the Handles clause.
    ' Visual Basic
    Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click, Button2.Click
    'Add Event Handler Code Here
    End Sub
    
  6. Add the appropriate code to the event handler.

To connect multiple events to a single event handler in C#

  1. Select the control to which you want to connect an event handler.
  2. In the Properties window, click the Events button (Aa984307.vxeventsbutton_propertieswindow(en-us,VS.71).gif).
  3. Click the name of the event that you want to handle.
  4. In the value section next to the event name, click the drop-down button to display a list of existing event handlers that match the method signature of the event you want to handle.
  5. Select the appropriate event handler from the list.

    Code will be added to the form to bind the event to the existing event handler.

See Also

Event Handling in Windows Forms | Introduction to Event Handlers in Windows Forms | Creating Event Handlers on the Windows Forms Designer | Creating Windows Forms

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