This documentation is archived and is not being maintained.

Control.SizeChanged Event

Occurs when the Size property value changes.

Namespace: System.Windows.Forms
Assembly: System.Windows.Forms (in

event EventHandler^ SizeChanged {
	void add (EventHandler^ value);
	void remove (EventHandler^ value);
/** @event */
public void add_SizeChanged (EventHandler value)

/** @event */
public void remove_SizeChanged (EventHandler value)

JScript supports the use of events, but not the declaration of new ones.

It is preferable to use the Layout event to handle custom layouts. The Layout event is raised in response to Resize events, but also in other conditions when layout might need to be applied.

This event is raised if the Size property is changed by either a programmatic modification or user interaction.

For more information about handling events, see Consuming Events.

The following code example demonstrates the SizeChanged event. An instance of a Button control has been provided that can be scaled both horizontally and vertically. A NumericUpDown instance provides the horizontal and vertical scale value. The Button instance named OK is used to set the scale values for the Button control instance. Whenever the size of the control changes, the event handler associated with the SizeChanged event of the control is called. This event handler displays a message box indicating that the size of the control has changed.

   void RegisterEventHandler()
      myButton1->SizeChanged += gcnew EventHandler( this, &MyForm::MyButton1_SizeChanged );

   void MyButton2_Click( Object^ /*sender*/, System::EventArgs^ /*e*/ )
      // Set the scale for the control to the value provided.
      float scale = (float)myNumericUpDown1->Value;
      myButton1->Scale( scale );

   void MyButton1_SizeChanged( Object^ /*sender*/, System::EventArgs^ /*e*/ )
      MessageBox::Show( "The size of the 'Button' control has changed" );

private void RegisterEventHandler()
    myButton1.add_SizeChanged(new EventHandler(this.myButton1_SizeChanged));
} //RegisterEventHandler

private void myButton2_Click(Object sender, System.EventArgs e)
    // Set the scale for the control to the value provided.
    float scale = (float)System.Convert.ToDouble(myNumericUpDown1.
} //myButton2_Click

private void myButton1_SizeChanged(Object sender, System.EventArgs e)
    MessageBox.Show("The size of the 'Button' control has changed");
} //myButton1_SizeChanged

Windows 98, Windows 2000 SP4, Windows CE, Windows Millennium Edition, Windows Mobile for Pocket PC, Windows Mobile for Smartphone, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see System Requirements.

.NET Framework

Supported in: 2.0, 1.1, 1.0