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Control.SizeChanged Event

Occurs when the Size property value changes.

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

'Declaration
Public Event SizeChanged As EventHandler

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 Handling and Raising 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.

Private Sub RegisterEventHandler()
   AddHandler myButton1.SizeChanged, AddressOf MyButton1_SizeChanged
End Sub 'RegisterEventHandler

Private Sub MyButton2_Click(sender As Object, e As EventArgs) 
   ' Set the scale for the control to the value provided. 
   Dim scale As Single = CSng(myNumericUpDown1.Value)
   myButton1.Scale(scale)
End Sub 'MyButton2_Click

Private Sub MyButton1_SizeChanged(sender As Object, e As EventArgs)
   MessageBox.Show("The size of the 'Button' control has changed")
End Sub 'MyButton1_SizeChanged

.NET Framework

Supported in: 4.5.2, 4.5.1, 4.5, 4, 3.5, 3.0, 2.0, 1.1, 1.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

Windows 8.1, Windows Server 2012 R2, Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)

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

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