UdpClient.Begin Receive callback function??

[Tenacious]

MSDN gives this code as an example to create a callback function for
UdpClient.Begin Receive. It doesn't compile because the compiler does
not recognize "UdpState". I can't find any info on it either. Does
anyone know what "UdpState" is or could you point me to some sample
code on how to properly implement a ReceiveCallback function? Any help
would be appreciated.

public static bool messageReceived = false;
public static void ReceiveCallback (IAsyncResult ar)
{
UdpClient u = (UdpClient)((Ud pState)(ar.Asyn cState)).u;
IPEndPoint e = (IPEndPoint)((U dpState)(ar.Asy ncState)).e;

Byte[] receiveBytes = u.EndReceive(ar , ref e);
string receiveString = Encoding.ASCII. GetString(recei veBytes);

Console.WriteLi ne("Received: {0}", receiveString);
messageReceived = true;
}

MSDN link:
ms-help://MS.MSDN.vAug06. en/cpref10/html/M_System_Net_So ckets_UdpClient _BeginReceive_1 _2bb042b2.htm

[Patrick Steele]

In article <11************ *********@b28g2 000cwb.googlegr oups.com>,
CT*******@yahoo .com says...

MSDN gives this code as an example to create a callback function for
UdpClient.Begin Receive. It doesn't compile because the compiler does
not recognize "UdpState". I can't find any info on it either. Does
anyone know what "UdpState" is or could you point me to some sample
code on how to properly implement a ReceiveCallback function? Any help
would be appreciated.

public static bool messageReceived = false;
public static void ReceiveCallback (IAsyncResult ar)
{
UdpClient u = (UdpClient)((Ud pState)(ar.Asyn cState)).u;
IPEndPoint e = (IPEndPoint)((U dpState)(ar.Asy ncState)).e;

Byte[] receiveBytes = u.EndReceive(ar , ref e);
string receiveString = Encoding.ASCII. GetString(recei veBytes);

Console.WriteLi ne("Received: {0}", receiveString);
messageReceived = true;
}

MSDN link:
ms-help://MS.MSDN.vAug06. en/cpref10/html/M_System_Net_So ckets_UdpClient _BeginReceive_1 _2bb042b2.htm

Looks like they missed part of the code. My guess is that it's a simple
class to maintain some state in the Async call. Probably:

public class UdpState
{
public UdpClient u;
public IPEndPoint e;
}

--
Patrick Steele
http://weblogs.asp.net/psteele