ScriptManager.AsyncPostBackSourceElementID Property

Definition

Namespace:

System.Web.UI

Assembly:

System.Web.Extensions.dll

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

public:
 property System::String ^ AsyncPostBackSourceElementID { System::String ^ get(); };

[System.ComponentModel.Browsable(false)]
public string AsyncPostBackSourceElementID { get; }

[<System.ComponentModel.Browsable(false)>]
member this.AsyncPostBackSourceElementID : string

Public ReadOnly Property AsyncPostBackSourceElementID As String

Property Value

String

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

Attributes

BrowsableAttribute

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.

See also

• RegisterAsyncPostBackControl(Control)