First of all as mentioned by Tony, try putting both the XAML on the same ASPX page as dividing your XAMLs across ASPX pages defeats the purpose of using Silverlight. You will be better off using ASP.NET alone. still if you need to span across ASPXX pages, another alternative is to store your results in IsolatedStorage and then have your second XAML read the ISOStorage. This way you will not be passing the same data back and forth to the server multiple times.