Determine PostBack Control or AJAX Request Initiator

RELATED TO:

AUTHOR: Eyup Yusein

DATE MODIFIED : April 16, 2018

DATE POSTED: November 27, 2017


DESCRIPTION

In some scenarios it might prove helpful to know which control has caused the PostBack or partial request action to the server.

SOLUTION

You can use one of these approaches to achieve this requirement.

protected void Page_Load(object sender, EventArgs e)
{
    string id1 = Request.Params["__EVENTTARGET"];
    string id2 = Request.Form["__EVENTTARGET"];
    string id3 = ScriptManager.GetCurrent(Page).AsyncPostBackSourceElementID;
    bool isAJAX = ScriptManager.GetCurrent(Page).IsInAsyncPostBack;
    if (isAJAX)
    {
        string id4 = DeterminePostBackMode()["__EVENTTARGET"];
    }
}


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