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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)

[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: 4.6, 4.5, 4, 3.5
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