Udp .NET Component

Use the Udp component within the .NET Framework to send and receive user datagrams. Features include:

Simple, intuitive Listen, Send, and Receive methods handle all communication.
JoinMulticastGroup and LeaveMulticastGroup makes managing multicast communication easy.
Send UDP data synchronously or asynchronously.
Trace event exposes the underlying UDP communication.
Design-time editor assists in protocol testing.
C# and VB.NET sample projects with source.
Integrates with all versions of Visual Studio and supports C#, VB.NET, ASP.NET, Delphi 8, C# Builder, and other .NET compliant development environments.
Includes a royalty-free license!

Looking for the ActiveX version of this component?

Interface

Public Constructors
Udp	Overloaded. Initialize a new instance of the Udp class.
Public Properties
Active	Returns true when listening for datagrams.
Available	Gets the total number of bytes available.
BufferSize	Gets and sets the size of the system receive buffer.
Busy	Returns true if a method is currently in use.
Charset	Gets and sets the character set used for string/byte array conversions.
DoEvents	Gets or sets a value that controls the processing of events during blocking method calls.
Editor	In Visual Studio.NET, displays an interactive form to use to test real time protocol operations.
LocalEndPoint	Gets the IP interface and port currently in use.
MulticastInterface	Gets or sets the host interface to use when sending multicast datagrams.
MulticastTimeToLive	Gets and sets the IP multicast time-to-live used when datagrams are sent to multicast addresses.
Socket	Returns the instance of the System.Net.Sockets.Socket that is accepting connections.
SynchronizingObject	Set this object to automatically control thread marshalling between worker threads and the main UI thread.
Tag	Gets or sets an object reference that can be used to associate this instance with any other.
Timeout	Specifies the maximum number of milliseconds to wait for responses to commands or time between data buffer transfers.
Public Methods
BeginReceive	Overloaded. Asynchronously receive a datagram, specifying a buffer, offset, size and SocketFlags value.
BeginSend	Overloaded. Asynchronously send a datagram to the specified remote address and port, specifying a buffer, offset, size and SocketFlags value.
Close	Close the socket.
JoinMulticastGroup	Join the specified multicast group for receiving datagrams.
LeaveMulticastGroup	Leave the specified multicast group for receiving datagrams.
Open	Overloaded. Allocate a socket at the specified address and port for sending and receiving datagrams.
Receive	Overloaded. Receive a datagram, specifying a buffer, offset, length and SocketFlags value.
Send	Overloaded. Send a datagram to the specified remote address and port, specifying a buffer, offset, length and SocketFlags value.
Public Events
ActiveChanged	Raised when the value of the Object.Active property changes.
EndReceive	Raised when the Udp.BeginReceive request completes.
EndSend	Raised when the Udp.BeginSend request completes.
Trace	Raised when data has been sent/received.

Code Example

How easy is the Udp component to use? The following example demonstrates sending datagrams to a UDP echo server and receiving the response.

VB.NET Example
' Listen on the default interface and an ephemeral port.
Udp1.Open()

' Send a datagram to a echo server
Dim s as String = "test"

' Send the string s to the host "MyEchoServer" on port 7.
Udp1.Send(s, "MyEchoServer", 7)

' Receive the echoed data
Dim d as Datagram = Udp1.Receive(s.Length)

' Display the data.
Debug.WriteLine(d.ToString())

'* Output
'* ------------------------
'* test
'* ------------------------
'*

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