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The messages in the chat application are slightly more detailed than simple strings. Each message includes three details: the text, the sender s chosen name, and the sender s time when the message was submitted. These three details are encapsulated in a custom Message class: public class Message { public string MessageText {get; set;} public string Sender {get; set;} public DateTime SendTime {get; set;} public Message(string messageText, string sender) { MessageText = messageText; Sender = sender; SendTime = DateTime.Now; } // A no-argument constructor allows instances of this class to be serialized. public Message(){} } To send a message, the user enters some text and clicks the Send button. At this point, you must create a new SocketAsyncEventArgs object. (Remember, the first one is still in use, waiting to receive new messages on a background thread.) The new SocketAsyncEventArgs object needs to store the buffer of message data. To create it, you begin by constructing a Message object. You then serialize that message object to a stream with the XmlSerializer, convert it to a simple byte array, and add it to the SocketAsyncEventArgs object using the BufferList property, as shown here: private void cmdSend_Click(object sender, RoutedEventArgs e) { if ((socket == null) || (!socket.Connected)) { AddMessage("ERROR: Not connected."); return; } // Create the MemoryStream where the serialized data will be placed. MemoryStream ms = new MemoryStream(); // Use the XmlSerializer to serialize the data. XmlSerializer serializer = new XmlSerializer(typeof(Message)); serializer.Serialize(ms, new Message(txtMessage.Text, txtName.Text)); // Convert the serialized data in the MemoryStream to a byte array. byte[] messageData = ms.ToArray(); // Place the byte array in the SocketAsyncEventArgs object, // so it can be sent to the server. SocketAsyncEventArgs args = new SocketAsyncEventArgs(); List<ArraySegment<byte>> bufferList = new List<ArraySegment<byte>>();

The clr enabled option within SQL Server 2008 allows SQL Server to run assemblies. By default, the option is disabled, or set to zero. That means assembly executions aren t allowed

bufferList.Add(new ArraySegment<byte>(messageData)); args.BufferList = bufferList; // Send the message. socket.SendAsync(args); } Unfortunately, because the Socket class in Silverlight works at a lower level than the TcpClient class in .NET, you don t have the straightforward stream-based access to the network connection that you have on the server side.

The last step is to create a new list based on the Requirement content type. You ll do this the same way that you created the Functional Areas list. Select the Lists and Libraries link in the Navigation pane and then click the Custom List button in the ribbon. Enter the name Requirements, as shown in Figure 2-20.

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Tip You can write any type of data you want to the server, in any form. You certainly don t need to use XmlSerializer. However, serialization gives you a simple way to pass along a bundle of information as an instance of some class.

EXEC sys.sp_configure 'clr enabled' ,1 GO RECONFIGURE GO Changes to the clr enabled option are effective immediately. You do not need to restart include user assemblies to unload immediately following the RECONFIGURE statement.

When a message is sent to the client, the other SocketAsyncEventArgs object fires its Completed event, which triggers the OnSocketReceive() event handler. You now need to deserialize the message, display it, and wait for the next one: private void OnSocketReceive(object sender, SocketAsyncEventArgs e) { if (e.BytesTransferred == 0) { AddMessage("Server disconnected."); try { socket.Close(); } catch { } return; } try { // Retrieve and display the message. XmlSerializer serializer = new XmlSerializer(typeof(Message)); MemoryStream ms = new MemoryStream(); ms.Write(e.Buffer, 0, e.BytesTransferred); ms.Position = 0; Message message = (Message)serializer.Deserialize(ms); AddMessage("[" + message.Sender + "] " + message.MessageText + " (at " + message.SendTime.ToLongTimeString() + ")"); } catch (Exception err) {

Select the Requirements list to display the List Settings page. Select the Allow management of content types check box. Add the Requirement content type to this list, set this as the default content type, and then remove the Item content type.

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