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)

[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 ("").

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: 4.5, 4, 3.5

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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