PORTSCAN

public class PortScan
{
	public class PortScanEvent : EventArgs
	{
		public PortScanEvent(string ip, long port, EventType eventType)
		{
			this.ip = ip;
			this.port = port;
			this.eventType = eventType;
		}
		public PortScanEvent(string ip, long port, EventType eventType, SocketException socketException)
		{
			this.ip = ip;
			this.port = port;
			this.eventType = eventType;
			this.socketException = socketException;
		}
		public string ip;
		public long port;
		public EventType eventType;
		public SocketException socketException;
	}

	[Flags] public enum EventType : ushort
	{
		Open,
		Close,
		Error
	}
	public struct ParamFunct
	{
		public ParamFunct(string ip, int port)
		{
			this.ip = ip;
			this.port = port;
		}
		public string ip;
		public int port;
	}

	public int count = 0;
	public int maxCount = 0;
	public ManualResetEvent eventDone = new ManualResetEvent(false);

	public delegate void PortScanHandler(object sender, PortScanEvent e);
	public event PortScanHandler OnPortScanEvent;

	public EventType eventTypeSouscrib = EventType.Open;

	public void Scan(object portArg)
	{
		ParamFunct paramFunctScan = (ParamFunct)portArg;
		TcpClient objTCP = new TcpClient();
		try
		{
			objTCP.Connect(paramFunctScan.ip, paramFunctScan.port);
			objTCP.Close();
			if(eventTypeSouscrib == EventType.Open && OnPortScanEvent != null)
				OnPortScanEvent(this, new PortScanEvent(paramFunctScan.ip, paramFunctScan.port, EventType.Open));
		}
		catch(SocketException e)
		{
			if (e.ErrorCode == 11001 || e.ErrorCode == 10060)
			{
				if(eventTypeSouscrib == EventType.Error && OnPortScanEvent != null)
					OnPortScanEvent(this, new PortScanEvent(paramFunctScan.ip, paramFunctScan.port, EventType.Error, e));
			}
			else
			{
				if(eventTypeSouscrib == EventType.Close && OnPortScanEvent != null)
					OnPortScanEvent(this, new PortScanEvent(paramFunctScan.ip, paramFunctScan.port, EventType.Close, e));
			}
		}
		finally
		{
			Interlocked.Increment(ref count);
			if (count == maxCount) 
			{
				eventDone.Set();
			}
		}
	}
}