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Control.Unload Event

Occurs when the server control is unloaded from memory.

Namespace:  System.Web.UI
Assembly:  System.Web (in System.Web.dll)

public event EventHandler Unload

Server controls must perform any final clean-up, such as closing files, database connections and discarding objects, during this stage of the control lifecycle before the instance is unloaded.

TopicLocation
How to: Create Event Handlers in ASP.NET Web PagesBuilding ASP .NET Web Applications
How to: Create Event Handlers in ASP.NET Web PagesBuilding ASP .NET Web Applications

.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.

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