C#:只运行一个程序

public void A()
{
//=====创建互斥体法：=====
bool blnIsRunning;
Mutex mutexApp = new Mutex(false, Assembly.GetExecutingAssembly().FullName, out blnIsRunning);
if (!blnIsRunning)
{
MessageBox.Show("程序已经运行！", "提示",MessageBoxButtons.OK, MessageBoxIcon.Exclamation);
return;
}
}

public void B()
{
//保证同时只有一个客户端在运行
System.Threading.Mutex mutexMyapplication = new System.Threading.Mutex(false, "OnePorcess.exe");
if (!mutexMyapplication.WaitOne(100, false))
{
MessageBox.Show("程序" + Application.ProductName + "已经运行！", Application.ProductName,
MessageBoxButtons.OK, MessageBoxIcon.Error);
return;
}
}

public void c()
{
//=====判断进程法：(修改程序名字后依然能执行)=====
Process current = Process.GetCurrentProcess();
Process[] processes = Process.GetProcessesByName(current.ProcessName);
foreach (Process process in processes)
{
if (process.Id != current.Id)
{
if (process.MainModule.FileName == current.MainModule.FileName)
{
MessageBox.Show("程序已经运行！", Application.ProductName,
MessageBoxButtons.OK, MessageBoxIcon.Exclamation);
return;
}
}
}
}