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ScriptManager.AsyncPostBackSourceElementID Property

.NET Framework 4.5

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)

[BrowsableAttribute(false)]
public string AsyncPostBackSourceElementID { get; }

Property Value

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

Remarks

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

A postback from a control that is inside an UpdatePanel control whose ChildrenAsTriggers property is set to true (the default).
A postback from a control that is a trigger for an UpdatePanel control.
A postback from a control that is registered by calling the RegisterAsyncPostBackControl method of the ScriptManager control.

Version Information

.NET Framework

Supported in: 4.5, 4, 3.5

Platforms

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.

Reference

ScriptManager Class

System.Web.UI Namespace

RegisterAsyncPostBackControl

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