C# - NullReferenceException On PreviousPage Property?

Jan 11, 2011

I followed the directions from MSDN on transferring data between asp.net pages.But when using the 'PreviousPage' property to access the previous pages controls, I get a null ref exception that PreviousPage is not set to an instance of an object.Here is my code:

public partial class Portal : System.Web.UI.Page
public string Username


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