public static void Main()
{
try
{ RegistryKey key = Registry.LocalMachine.OpenSubKey(@"software\zrh");// 读注册表以判断是否正在运行 if (key == null)//如果不存在，就创建标志位
{ RegistryKey writekey = Registry.LocalMachine.CreateSubKey(@"software\zrh"); writekey.SetValue("instanceFlag", "1"); 
/**//*调用应用程序代码*/
} else
{ MessageBox.Show("the application has running"); } } catch (Exception ex)
{ MessageBox.Show(" on exception is occuring \n" + ex.Message); }
} try Microsoft.Win32.RegistryKey flagKey = Microsoft.Win32.Registry.LocalMachine.OpenSubKey(@"software", true); flagKey.DeleteSubKey("zrh"); } catch (Exception ex)
{ MessageBox.Show(" on exception is occuring \n" + ex.Message); }
