At times you may get a requirement to create a page which can accessible by anonymous users also. for example to provision the user to change their password or to log-in to the site. In that case you may have to go for creating a page where user can perform this kind of actions. To create such page you cannot use the default LayoutsPageBase base class for your page because it would trigger SharePoint to prompt anonymous users to log on.

Instead, you need to use another base class for your anonymous application page calledUnsecuredLayoutsPageBase. You can find its MSDN reference at: 

http://msdn.microsoft.com/en-us/library/microsoft.sharepoint.webcontrols.unsecuredlayoutspagebase.aspx

Your page class would look like this:

public partial class ApplicationPage1 : UnsecuredLayoutsPageBase

{

    protected void Page_Load(object sender, EventArgs e)

    {

    }

}