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ScriptManager.AsyncPostBackSourceElementID Property

Gets the unique ID of the control that caused the asynchronous postback.

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

'Declaration
<BrowsableAttribute(False)> _
Public ReadOnly Property AsyncPostBackSourceElementID As String

Property Value

Type: System.String
The unique ID of a control, if the control has an ID; otherwise, an empty string ("").

The AsyncPostBackSourceElementID property contains the value of the control ID that caused the asynchronous postback, which can be one of the following:

.NET Framework

Supported in: 4, 3.5

Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2

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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