This is particularly noticeable and reproducible if you are using the HttpWebRequest class to stream data (for more information on streaming data from Silverlight you can listen to my podcast and read my article in a free MSDN book). You can then reproduce the loss of connection using Fiddler (which seriously rocks and is becoming more and more useful) by right-clicking on the streaming connection and selecting “Abort Session”.

Fiddler - Abort Session

The best solution to resolve this that I’ve found is to manually invoke the garbage collector whenever you detect the connection loss.

// Manually invoke Garbage collection
GC.Collect();

Related posts:

1. Using Fiddler to trick Silverlight into allowing a crossdomain Web Request
2. How to make a cross domain web request with SilverLight 2
3. Making cross domain JavaScript requests using XMLHttpRequest or XDomainRequest