Implementation method of setting the busy state of the mouse using multi-threaded handle

using System;
using ;
using ;
using ;
using ;
using ;
using ;
using ;
using ;

namespace CursorThread
{
    public partial class Form1 : Form
    {
        public delegate int DoSomethingDelegate(int data);

        public Form1()
        {
            InitializeComponent();
        }

        static int DoSomething(int data)
        {
            /// <sumary>
            /// Do something in this method
            /// </sumary>
            (300);
            return data++;

        }

        private void button1_Click(object sender, EventArgs e)
        {
            = ;

            DoSomethingDelegate d = DoSomething;
            IAsyncResult ar = (100,null, null);

            while (true)
            {
                = ;
                if((50, false))
                {
                    = ;
                    break;
                }
            }

            //Get the result
            int result = (ar);
            (());

        }
    }
}