Starts listening for incoming connection requests.
Assembly: System (in System.dll)
The Start method initializes the underlying Socket, binds it to a local endpoint, and listens for incoming connection attempts. If a connection request is received, the Start method will queue the request and continue listening for additional requests until you call the Stop method. If TcpListener receives a connection request after it has already queued the maximum number of connections, it will throw a SocketException on the client.
To remove a connection from the incoming connection queue, use either the AcceptTcpClient method or the AcceptSocket method. The AcceptTcpClient method will remove a connection from the queue and return a TcpClient that you can use to send and receive data. The AcceptSocket method will return a Socket that you can use to do the same. If your application only requires synchronous I/O, use AcceptTcpClient. For more detailed behavioral control, use AcceptSocket. Both of these methods block until a connection request is available in the queue.
This member outputs trace information when you enable network tracing in your application. For more information, see Network Tracing.
The following code example demonstrates how Start is used to listen for incoming client connection attempts.
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.