Cross Page postback in ASP.NET

In this example i am going to describe Cross Page Posting in ASP.NET 2.0 / 3.5 using C# and VB.NET. Cross Page posting is used to submit a form on one page (say default.aspx) and retrieve values of controls of this page on another page (say Default2.aspx) There are two ways we can use cross page postsbacks in ASP.NET