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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


Type: System.Net.IPAddress
The IPAddress of the host to which you intend to connect.
Type: System.Int32
The port number to which you intend to connect.


The address parameter is null.


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);

.NET Framework

Supported in: 4, 3.5, 3.0, 2.0, 1.1, 1.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows XP SP2 x64 Edition, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.