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To use the socket class, you use three asynchronous methods: ConnectAsync(), SendAsync(), and ReceiveAsync(). All three of these methods require a SocketAsyncEventArgs object. This object stores a reference to the socket (in the UserToken property) and the remote connection (in the RemoteEndPointProperty). It also provides a Completed event that fires when the appropriate operation is finished. To perform any task with a socket in Silverlight, you must create and configure a SocketAsyncEventArgs object and then pass it to one of the asynchronous Socket methods.

As a compromise, you could provide an easy way for users to request another (and therefore different) captcha on the initial form if they can t read the first one, rather than allowing them to retry after the fact.

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The first task in the messaging client is to establish a connection when the user clicks the Connect button. Here s what happens: ' The socket for the underlying connection. Private socket As Socket Private Sub cmdConnect_Click(ByVal sender As Object, ByVal e As RoutedEventArgs) Try If (socket IsNot Nothing) AndAlso (socket.Connected) Then socket.Close() End If Catch err As Exception AddMessage("ERROR: " & err.Message) End Try Dim endPoint As New DnsEndPoint( _ Application.Current.Host.Source.DnsSafeHost, 4530) socket = New Socket(AddressFamily.InterNetwork, _ SocketType.Stream, ProtocolType.Tcp) Dim args As New SocketAsyncEventArgs() args.UserToken = socket args.RemoteEndPoint = endPoint AddHandler args.Completed, AddressOf OnSocketConnectCompleted socket.ConnectAsync(args) End Sub Most of these details are fairly straightforward. If the socket is already opened, it s closed. Then, a DnsEndPoint object is created to identify the location of the remote host. In this case, the location of the remove host is the web server that hosts the Silverlight page, and the port number is 4530. Finally, the code creates the SocketAsyncEventArgs, and attaches the OnSocketConnectCompleted() event to the Completed event.

WAITFOR ( RECEIVE TOP(1) @ch = conversation_handle, @messagetypename = message_type_name, @messagebody = CAST(message_body AS XML) FROM ShippingQueue ), TIMEOUT 1000 IF (@@ROWCOUNT = 0) BEGIN ROLLBACK TRANSACTION BREAK END IF (@messagetypename = 'http://ssb.csharp.at/SSB_Book/c06/ShippingRequestMessage') BEGIN DECLARE @name NVARCHAR(256); DECLARE @address NVARCHAR(256); DECLARE @zipCode NVARCHAR(10); DECLARE @city NVARCHAR(256); DECLARE @country NVARCHAR(256); -- Extract the information from the ShippingRequestMessage SET @name = @messagebody.value('/Shipping[1]/Name[1]', 'NVARCHAR(256)'); SET @address = @messagebody.value('/Shipping[1]/Address[1]', 'NVARCHAR(256)'); SET @zipCode = @messagebody.value('/Shipping[1]/ZipCode[1]', 'NVARCHAR(10)'); SET @city = @messagebody.value('/Shipping[1]/City[1]', 'NVARCHAR(256)'); SET @country = @messagebody.value('/Shipping[1]/Country[1]', 'NVARCHAR(256)'); -- Insert the information into the shipping table INSERT INTO ShippingInformation (ShippingID, [Name], Address, ZipCode, City, Country) VALUES ( NEWID(), @name, @address, @zipCode, @city, @country ) -- Send the response message back to the OrderService SET @responsemessage = '<ShippingResponse>1</ShippingResponse>'; SEND ON CONVERSATION @ch MESSAGE TYPE [http://ssb.csharp.at/SSB_Book/c06/ShippingResponseMessage] (@responsemessage);

Note Remember, unless you specify otherwise, the client s port is chosen dynamically from the set of

One completely unknown factor in every online application is the user s capabilities. Even when the user is in fact an actual human rather than an attacking machine, or perhaps especially when the user is a human, unanticipated insufficiencies or difficulties on the user s end may get in the way of a successful response to even the simplest captcha challenge. A user with a visual disability or deficiency is likely to have little or no chance of fulfilling a visual captcha challenge; one with an aural disability or deficiency, or with missing or malfunctioning audio software or hardware, is similarly handicapped when presented with an audio captcha. As a programmer, you need to avoid falling into the trap of assuming that even a well-crafted captcha challenge will automatically succeed in allowing a human user to qualify. As a safety device, to improve the chances for success, you should at least offer alternatives so that accidents of user capabilities do not automatically disqualify legitimate users.

available ports when the connection is created. That means you could create a client that opens multiple connections to the same server. On the server side, each connection would be dealt with uniquely, because each connection would have a different client port number.

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