Windows Phone storage, testing thread safety with Isolated Storage.

Windows Phone storage tests

The code which writes a file using Isolated Storage:

        private void CreateNewFileUsingIsolatedStorage(string filePath)
        {
            using (var myIsolatedStorage = IsolatedStorageFile.GetUserStoreForApplication())
            {
                using (var fileStream = myIsolatedStorage.OpenFile(filePath, FileMode.Create, FileAccess.Write))
                {
                    using (var writer = new StreamWriter(fileStream))
                    {
                        var someTextData = "Some content";
                        writer.WriteLine(someTextData);
                    }
                }
            }
        }
        

Simulated test:

           for (int i = 0; i < 3; i++)
            {
                ThreadPool.QueueUserWorkItem(x =>
                {
                    var fileName = "File_" + i;
                    CreateNewFileUsingIsolatedStorage(fileName);
                });
            }
            
Problem: Isolated Storage randomly throws this exception:

System.IO.IsolatedStorage.IsolatedStorageException was unhandled
  HResult=-2146233264
  Message=Operation not permitted on IsolatedStorageFileStream.
  Source=mscorlib
  StackTrace:
       at System.IO.IsolatedStorage.IsolatedStorageFileStream..ctor(String path, FileMode mode, FileAccess access, FileShare share, Int32 bufferSize, IsolatedStorageFile isf)
       at System.IO.IsolatedStorage.IsolatedStorageFile.OpenFile(String path, FileMode mode, FileAccess access)
       at PhoneApp95.MainPage.CreateNewFile(String filePath)
       at PhoneApp95.MainPage.<>c__DisplayClass2.<ButtonBase_OnClick>b__0(Object x)
       at System.Threading.QueueUserWorkItemCallback.WaitCallback_Context(Object state)
       at System.Threading.ExecutionContext.RunInternal(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx)
       at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx)
       at System.Threading.QueueUserWorkItemCallback.System.Threading.IThreadPoolWorkItem.ExecuteWorkItem()
       at System.Threading.ThreadPoolWorkQueue.Dispatch()
       at System.Threading._ThreadPoolWaitCallback.PerformWaitCallback()
  InnerException: