What is the difference between PostBack and Callback ( !IsPostBack and if(!IsCallback

[qwedster]

Folks!

What is the difference between PostBack and IsCallback ( !IsPostBack and if(!IsCallback))

Like in the following Code Snippet:

public partial class _Default : System.Web.UI.Page
    {
        protected void Page_Load(object sender, EventArgs e)
        {
            if (!IsPostBack)
            {

            }

            if(!IsCallback)
            {

            }
        }
    }

As far as I know, when I 1) refresh the page or 2) revert back to the page after round trip, the behavior is such that IsPostBack = !IsCallback. I don't find any difference.

Can you please explain with example code?

I just want a sample code (for Page_Load event) that will demonstrate the difference in the Page_Load event so that I can toggle breakpoint and understand it for myself.

Thanks.