System.Security.Tests.SecureStringTests.ThreadSafe_Stress C# (CSharp) Method

        public static void ThreadSafe_Stress(int executionTimeSeconds)
        {
            using (var ss = new SecureString())
            {
                DateTimeOffset end = DateTimeOffset.UtcNow + TimeSpan.FromSeconds(executionTimeSeconds);
                Task.WaitAll(Enumerable.Range(0, Environment.ProcessorCount).Select(_ => Task.Run(() =>
                {
                    var rand = new Random(Task.CurrentId.Value);
                    while (DateTimeOffset.UtcNow < end)
                    {
                        char c = (char)rand.Next(0, char.MaxValue);
                        switch (rand.Next(12))
                        {
                            case 0:
                                ss.AppendChar(c);
                                break;
                            case 1:
                                ss.InsertAt(0, c);
                                break;
                            case 2:
                                try { ss.SetAt(0, c); } catch (ArgumentOutOfRangeException) { }
                                break;
                            case 3:
                                ss.Copy().Dispose();
                                break;
                            case 4:
                                Assert.InRange(ss.Length, 0, ushort.MaxValue + 1);
                                break;
                            case 5:
                                ss.Clear();
                                break;
                            case 6:
                                try { ss.RemoveAt(0); } catch (ArgumentOutOfRangeException) { }
                                break;
                            case 7:
                                Assert.False(ss.IsReadOnly());
                                break;
                            case 8:
                                Marshal.ZeroFreeCoTaskMemAnsi(SecureStringMarshal.SecureStringToCoTaskMemAnsi(ss));
                                break;
                            case 9:
                                Marshal.ZeroFreeCoTaskMemUnicode(SecureStringMarshal.SecureStringToCoTaskMemUnicode(ss));
                                break;
                            case 10:
                                Marshal.ZeroFreeGlobalAllocAnsi(SecureStringMarshal.SecureStringToGlobalAllocAnsi(ss));
                                break;
                            case 11:
                                Marshal.ZeroFreeGlobalAllocUnicode(SecureStringMarshal.SecureStringToGlobalAllocUnicode(ss));
                                break;
                        }
                    }
                })).ToArray());
            }
        }