ASP.NET provides two mechanisms for transferring control from one page to another. You can use the System.Web.HttpServerUtility.Transfer(string) method to transfer processing between pages, or you can make a cross-page request by assigning a page URL to the System.Web.UI.WebControls.IButtonControl.PostBackUrl property of a button control that implements the System.Web.UI.WebControls.IButtonControl interface.

In either case, the Page.PreviousPage page property will contain an object that represents the previous or originator page. If, for example, Page A posts to Page B, Page A's Page.IsCrossPagePostBack property (accessible through the Page.PreviousPage property) will be true and Page B's Page.PreviousPage property will have the name of Page A.