C#判断程序是否运行

using System;
using System.Collections.Generic;
using System.Windows.Forms;
using System.Diagnostics;
using System.Collections;

namespace DataUpper
{
    static class Program
    {
        /**//// <summary>
        /// 应用程序的主入口点。
        /// </summary>
        [STAThread]
        static void Main()
        {
            int iProcessNum = 0;

            foreach (Process singleProc in Process.GetProcesses())
            {
                if (singleProc.ProcessName == Process.GetCurrentProcess().ProcessName)
                {
                    iProcessNum += 1;
                }
            }

            if (iProcessNum > 1)
            {
                MessageBox.Show("该程序已经在运行中!", "天科多协议处理子程序", MessageBoxButtons.OK, MessageBoxIcon.Information);
            }
            else
            {
                Application.EnableVisualStyles();
                Application.SetCompatibleTextRenderingDefault(false);
                Application.Run(new DataUpper());
            }
        }
    }
}