Concurrency in csharp (Asynchronous, Parallel, and Multithreaded Programming)

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/// <summary>     ///     /// </summary>     public partial class Form2 : Form     {           //[ComVisible(false)]         //public delegate void ParameterizedThreadStart(object objfield);               /// <summary>         ///         /// </summary>         public Form2()         {             InitializeComponent();         }         /// <summary>         ///         /// </summary>         /// <param name="sender"></param>         /// <param name="e"></param>         private void Form2_Load(object sender, EventArgs e)         {             MyDu du = new MyDu();               Control.CheckForIllegalCrossThreadCalls = false;             Thread t1 = new Thread(new ThreadStart(TestMethod));             Thread t2 = new Thread(new ParameterizedThreadStart(TestMethod));             //Thread t3 = new Thread(new ThreadStart(du.setData));             ThreadPool.QueueUserWorkItem(new WaitCallback(TaskProc1), new Person { Id = 1, Name = "测试", Count =100 });               du.BegID = 100;             du.EndID = 20000;             du.Le1 = this.label3;             du.Le2 = this.label4;             Thread t3 = new Thread(new ThreadStart(du.Run));               t1.IsBackground = true;             t2.IsBackground = true;             t3.IsBackground = true;             t1.Start();             t2.Start("hello");             t3.Start();         }         /// <summary>         ///         /// </summary>         /// <param name="x"></param>         public void TaskProc1(object x)   //执行的任务         {             Person person = x as Person;           }         //         private delegate void InvokeCallback(string msg);         //         private delegate void SetLabelDelegate(string value);         /// <summary>         ///         /// </summary>         void TestMethod()         {               //InvokeCallbackmsgCallback = new InvokeCallback(m_comm_MessageEvent);             string v = "geovind du 1";             this.label1.Text = v;             //if (this.InvokeRequired)             //{             //    SetLabelDelegate d = new SetLabelDelegate(TestMethod);             //    this.Invoke(d, new object[] { v});             //}             //else             //{             //    this.label1.Text = v;             //}         }           void TestMethod(object data)         {             if (this.InvokeRequired)             {                 SetLabelDelegate d = new SetLabelDelegate(TestMethod);                 this.Invoke(d, new object[] { data });             }             else             {                 string datastr = data as string;                 this.label2.Text = datastr;             }         }       }       public class Person     {         public int Id { get; set; }         public string Name { get; set; }         public int Count { get; set; }        }     /// <summary>     ///     /// </summary>     class MyDu     {                     private int begID;               public int BegID               {                   set{this.begID=value;}               }               private int endID;               public int EndID               {                   set{this.endID=value;}               }               private Label le1;               public Label Le1             {                 set { this.le1 = value; }             }               private Label le2;               public Label Le2             {                 set { this.le2 = value; }             }            /// <summary>            ///            /// </summary>             public void Run()             {                   method(begID, endID, le1, le2);               }             /// <summary>             ///             /// </summary>             /// <param name="begin"></param>             /// <param name="end"></param>             private void method(int begin,int end,Label labe,Label labe2)             {                 labe.Text = begin.ToString();                 labe2.Text = end.ToString();             }       }  }