title: Serializing Guid[] to binary quickly to store in C# AppFabric
body: <p>I am trying to read and write arrays of Guids to an AppFabric cache. My profiler shows me it is serializing this to Xml which means things are going far too slow. A <code>Guid[20000]</code> takes 60 ms to add to the cache whilst a similarly sized <code>int[80000]</code> takes 10 ms. I am figuring an array of Guids must surely look like a byte array somewhere internally. What is the fastest way to get to this, whilst generating as little meta-fluff as possible? I know where I will be adding and getting to/from the cache, and the data is not going to be particularly persistent, so I do not care about serializing class information.</p>