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+====== Threadpool ======
+<code c#>
+private static aaa()
+{
+    ThreadPool.QueueUserWorkItem(threadWorker,this);
+}
+private static void threadWorker(object obj)
+{
+    Form1 f = (Form1)obj;
+    {
+        if (f.comboFrom.InvokeRequired)
+        {
+            f.comboFrom.Invoke(new ComboAddThreadSafeDelegate(ComboAddThreadSafe), f, ComboItem);
+        }
+    }
+}
+private delegate void ComboAddThreadSafeDelegate(Form1 f, String val);
+private static void ComboAddThreadSafe(Form1 f, String val)
+{
+    f.comboFrom.Items.Add(val);
+}
+//or
+private static aaa()
+{
+    Action<object> resultCallback = (theResults) =>
+    {
+        MessageBox.Show((string)theResults);
+    };
+    WaitCallback workItem = (dataOrSomeDetails) =>
+    {
+        string a = (string)dataOrSomeDetails;
+        resultCallback(a + " someResults");
+    };
+    ThreadPool.QueueUserWorkItem(workItem, "text");
+}
+</code>