C# .NET class to Silverlight Class

I have a .net class that I need to port over to silverlight. This class is not real complicated. The current class however has some assembly problems that are not in silverlight. I am using NetworkStream, Hashtable, Queue, tcpclient and three unsafe blocks of code. If there is some kind of alternative in the silverlight assemblies or another way to achieve the same thing that would be great. I can send the project so you can look at it. It is confidential and you must not keep the project after you are finished. Thanks and good luck bidding.