JavaScript button disable with postback

When an ASP.NET server-side button is given client-side JavaScript code to execute when handling onclick, the button no longer posts back by default. However, there is a small piece of code you can add to the onclick attribute of the button to re-enable the postback behavior.

Adding this code in the Page_Load method will remove a server-side button's postback call:

btnConfirm.Attributes.Add("onclick", "Confirm_Click();")

But writing the code like this will reinstate the postback call:

btnConfirm.Attributes.Add("onclick", "Confirm_Click(); " + ClientScript.GetPostBackEventReference(btnConfirm, ""))