Different ways of starting a THREAD

//given Four methods
//1 without args, 2With one Arg, 3With return value,4consuming work
static void workHard()
{
for (int i = 0; i < 1000; i++) Console.Write("y");
}
static void workHardArg(object h)
{
if (h == null) h = string.Empty;
for (int i = 0; i < 1000; i++) { Console.Write(h.ToString()); }
}
static int WorkWithResult(string s) { return s.Length; }
private string DownloadString(string p)
{
try
{using (var wc = new System.Net.WebClient())return wc.DownloadString(p);}
catch(Exception err){}return string.Empty;
}

//1
Thread t = new Thread(workHard); t.Start();

//2
new Thread(workHard).Start();

//3
Thread t2 = new Thread(new ThreadStart(Form1.workHard));
t2.Start();

//4
Thread t3 = new Thread(() =>
{
for (int i = 0; i < 1000; i++) Console.Write("y");
});
t3.Start();

//5
Thread t4 = new Thread(workHardArg);
t4.Start("Hello from t4!");

//6
Thread t5 = new Thread(() => workHardArg("t5"));
t5.Start();

//7
Thread t6 = new Thread(delegate() { workHardArg("test"); });
t6.Start();

//8
Thread t10 = new Thread(workHardArg) { Name = "obedient", IsBackground = true, Priority = ThreadPriority.Lowest };
t10.Start("Hello from t!");

//9
Task.Factory.StartNew(workHard);

//10
ThreadPool.QueueUserWorkItem(workHardArg);
ThreadPool.QueueUserWorkItem(workHardArg, 123);

//11
Task<string> task = Task.Factory.StartNew<string>(() => DownloadString("http://www.linqpad.net"));
string result = task.Result;
MessageBox.Show(result);

//12
for (int i = 0; i < 10; i++)
new Thread(() => Console.Write(i)).Start();

//13
Func<string, int> method = WorkWithResult;
IAsyncResult cookie = method.BeginInvoke("test", null, null);
int result5 = method.EndInvoke(cookie);
Console.WriteLine("String length is: " + result);