让你的程序同时只能运行一个实例

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

namespace StressSync
{
static class Program
{
/// <summary>
/// The main entry point for the application.
/// </summary>
[STAThread]
static void Main()
{
bool bCreatedNew;
string strApp = System.Windows.Forms.Application.ExecutablePath;
strApp = strApp.Replace("\\\\", "").Replace(":", "");
System.Threading.Mutex mutex = new System.Threading.Mutex(true, strApp, out bCreatedNew);
if (!bCreatedNew)
{
//program alread run
MessageBox.Show("您已经运行了本程序,请确认!","警告",MessageBoxButtons.OK, MessageBoxIcon.Warning);
Environment.Exit(1);
}

Application.EnableVisualStyles();
Application.SetCompatibleTextRenderingDefault(false);
Application.Run(new frmMain());
}
}
}