TcpClient.Connect Method (String, Int32)


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Connects the client to the specified port on the specified host.

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

Public Sub Connect (
	hostname As String,
	port As Integer


Type: System.String

The DNS name of the remote host to which you intend to connect.

Type: System.Int32

The port number of the remote host to which you intend to connect.

Exception Condition

The hostname parameter is null.


The port parameter 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 host name 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 IPv6 is enabled and the Connect(String, Int32) method is called to connect to a host that resolves to both IPv6 and IPv4 addresses, the connection to the IPv6 address will be attempted first before the IPv4 address. This may have the effect of delaying the time to establish the connection if the host is not listening on the IPv6 address.


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 in the .NET Framework.

The following code example uses the host name and port number to connect with a remote host.

'Uses a host name and port number to establish a socket connection.
Dim tcpClient As New TcpClient()

   tcpClient.Connect("", 11002)

.NET Framework
Available since 1.1
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