TcpClient.Connect Method (IPAddress, Int32)

Connects the client to a remote TCP host using the specified IP address and port number.

Namespace: System.Net.Sockets
Assembly: System (in system.dll)

public void Connect (
	IPAddress address,
	int port
public void Connect (
	IPAddress address, 
	int port
public function Connect (
	address : IPAddress, 
	port : int
Not applicable.



The IPAddress of the host to which you intend to connect.


The port number to which you intend to connect.

Exception typeCondition


The address parameter is a null reference (Nothing in Visual Basic).


The port is not between MinPort and MaxPort.


An error occurred when accessing the socket. See the Remarks section for more information.


TcpClient is closed.

Call this method to establish a synchronous remote host connection to the specified IPAddress and port number. The Connect method will block until it either connects or fails. After connecting with the remote host, use the GetStream method to obtain the underlying NetworkStream. Use this NetworkStream to send and receive data.


If you receive a SocketException, use SocketException.ErrorCode to obtain the specific error code. After you have obtained this code, you can refer to the Windows Sockets version 2 API error code documentation in MSDN for a detailed description of the error.


This member outputs trace information when you enable network tracing in your application. For more information, see Network Tracing.

The following code example uses an IP Address and port number to connect with a remote host.

//Uses the IP address and port number to establish a socket connection.
TcpClient tcpClient = new TcpClient ();
IPAddress ipAddress = Dns.GetHostEntry ("").AddressList[0];

tcpClient.Connect (ipAddress, 11003);

//Uses the IP address and port number to establish a socket
// connection.
TcpClient tcpClient = new TcpClient();
IPAddress ipAddress =

tcpClient.Connect(ipAddress, 11003);

Windows 98, Windows Server 2000 SP4, Windows CE, Windows Millennium Edition, Windows Mobile for Pocket PC, Windows Mobile for Smartphone, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition

The Microsoft .NET Framework 3.0 is supported on Windows Vista, Microsoft Windows XP SP2, and Windows Server 2003 SP1.

.NET Framework

Supported in: 3.0, 2.0, 1.1, 1.0

.NET Compact Framework

Supported in: 2.0, 1.0