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TcpClient.BeginConnect Method (String, Int32, AsyncCallback, Object)

Note: This method is new in the .NET Framework version 2.0.

Begins an asynchronous request for a remote host connection. The remote host is specified by a host name (String) and a port number (Int32).

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

public IAsyncResult BeginConnect (
	string host,
	int port,
	AsyncCallback requestCallback,
	Object state
)
public IAsyncResult BeginConnect (
	String host, 
	int port, 
	AsyncCallback requestCallback, 
	Object state
)
public function BeginConnect (
	host : String, 
	port : int, 
	requestCallback : AsyncCallback, 
	state : Object
) : IAsyncResult

Parameters

host

The name of the remote host.

port

The port number of the remote host.

requestCallback

An AsyncCallback delegate that references the method to invoke when the operation is complete.

state

A user-defined object that contains information about the connect operation. This object is passed to the requestCallback delegate when the operation is complete.

Return Value

An IAsyncResult object that references the asynchronous connection.

Exception typeCondition

ArgumentNullException

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

SocketException

An error occurred when attempting to access the socket. See the Remarks section for more information.

ObjectDisposedException

The Socket has been closed.

SecurityException

A caller higher in the call stack does not have permission for the requested operation.

ArgumentOutOfRangeException

The port number is not valid.

The asynchronous BeginConnect operation must be completed by calling the EndConnect method. Typically, the method is invoked by the asyncCallback delegate.

This method does not block until the operation completes. To block until the operation completes, use one of the Connect method overloads.

For detailed information about using the asynchronous programming model, see Calling Synchronous Methods Asynchronously.

The following code example creates a TcpClient and connects to a remote host.

// Connect asynchronously to the specifed host.
public static void DoBeginConnect3(string host, int port)
{
    TcpClient t = new TcpClient(AddressFamily.InterNetwork);

    connectDone.Reset();

    Console.WriteLine("Establishing Connection to {0}", 
        host);
    t.BeginConnect(host, port, 
        new AsyncCallback(ConnectCallback), t);

    // Wait here until the callback processes the connection.
    connectDone.WaitOne();

    Console.WriteLine("Connection established");
}

Windows 98, Windows 2000 SP4, Windows Millennium Edition, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition

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

.NET Framework

Supported in: 2.0

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