.NET Framework Class Library
ControlOnUnload Method

Raises the Unload event.

Namespace:   System.Web.UI
Assembly:  System.Web (in System.Web.dll)
Protected Friend Overridable Sub OnUnload ( _
	e As [%$TOPIC/h27s82as_en-us_VS_110_2_0_0_0_0%] _
protected internal virtual void OnUnload(
	[%$TOPIC/h27s82as_en-us_VS_110_2_0_1_0_0%] e
protected public:
virtual void OnUnload(
	[%$TOPIC/h27s82as_en-us_VS_110_2_0_2_0_0%]^ e
abstract OnUnload : 
        e:[%$TOPIC/h27s82as_en-us_VS_110_2_0_3_0_0%] -> unit  
override OnUnload : 
        e:[%$TOPIC/h27s82as_en-us_VS_110_2_0_3_0_1%] -> unit


Type: SystemEventArgs

An EventArgs object that contains event data.


ASP.NET calls this method to raise the Unload event. If you are developing a custom control, you can override this method in order to provide additional processing. If you override this method, call the base control's OnUnload method to notify subscribers to the event.

' Override the OnUnLoad method to set _text to 
' a default value if it is null. 
Protected Overrides Sub OnUnload(ByVal e As EventArgs)
    If _text Is Nothing Then
        _text = "Here is some default text." 
    End If 
End Sub
// Override the OnUnLoad method to set _text to 
// a default value if it is null. 
protected override void OnUnload(EventArgs e)
    if (_text == null)
        _text = "Here is some default text.";
Version Information

.NET Framework

Supported in: 4.6, 4.5, 4, 3.5, 3.0, 2.0, 1.1, 1.0

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.