I'm dying here...  I have an object that I use to access objects in the
session state.  I may be reading and writing at the same time, so I am trying
to make the accessors thread safe using ReaderWriter locks.  Here's a
stripped down example of my class:

Class SessionLogic{
private static ReaderWriterLock myObjectLock = new ReaderWriterLock();

...

public MyObject MyObject{
 get
 {
     MyObject foo = null;
     myObjectLock.AcquireReaderLock(5000);
     try
     {
      foo = this.session["MyObject"] as MyObject;
      try
      {                       
         LockCookie monster = myObjectLock.UpgradeToWriterLock(5000);   
         try
         {
             foo = new MyObject();   
             this.session["MyObject"]  = foo;               
         }
         finally
         {
               myObjectLock.DowngradeFromWriterLock(ref monster);
         }
      }       
      catch (Exception ex)
      {
          string message = ex.Message;  // just so I can see
      }
    finally
    {
        myObjectLock.ReleaseReaderLock();
    }
    return foo;
  }
}
}

This structure is almost word for word out of MS' documentation on
ReaderWriterLock.  Yet whenever I run it, I get an error:  "Attempt to
release mutex not owned by caller."  What the...  Its the ONLY CALLER!  What
is happening here????