vb.net pdf 417 reader

vb.net pdf 417 reader

vb.net pdf 417 reader

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Let s see now how to write a managed Service Broker client with a .NET language of your choice that sends messages through the Service Broker infrastructure to another Service Broker service on the network. I assume that you ve already set up your Service Broker infrastructure that includes the following objects. The creation of these objects is also provided an as external T-SQL script in the Source Code/Download area of the Apress website (http://www.apress.com) for this chapter. Message types: [http://ssb.csharp.at/SSB_Book/c05/RequestMessage] and [http://ssb.csharp.at/SSB_Book/c05/ResponseMessage] Contract: [http://ssb.csharp.at/SSB_Book/c05/HelloWorldContract] Queues: InitiatorQueue and TargetQueue Services: InitiatorService and TargetService When you want to send a new message from a managed Service Broker client, you must follow these steps: 1. Create and open a new SqlConnection to the database hosting the client side of the Service Broker application. 2. Begin a new transaction. 3. Create a new Service class object. 4. Begin a new dialog with another Service Broker service. 5. Send a message over the created dialog. 6. Close the connection to the database. Listing 5-8 shows how you can accomplish these steps with the features provided by the managed assembly. Listing 5-8. Implementing the Managed Service Broker Client public static void Main() { SqlConnection cnn = null; SqlTransaction tran = null; TextReader reader = null; try { // Opening a new database connection cnn = new SqlConnection("Initial Catalog=5_ManagedServiceBroker; Data Source=localhost;Integrated Security=SSPI;"); cnn.Open(); // Starting a new database transaction tran = cnn.BeginTransaction();

Figure 14-20. Freezing the Product column Column freezing is a useful feature for very wide grids, especially when you want to make sure certain information (like the product name or a unique identifier) is always visible. To use it, you simply need to set the IsFrozen property of the column to true: <data:DataGridTextColumn Header="Product" Width="175" IsFrozen="True" Binding="{Binding ModelName}"></data:DataGridTextColumn> There s one catch. Frozen columns must always be on the left side of the grid. So if you freeze one column, it must be the leftmost column; if you free two columns, they must be the first two on the left, and so on.

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The Show Details feature allows an end-user to drill into a value that is derived from Analysis Services. The functionality of the drill-through is controlled by Analysis Services but it is rendered by PerformancePoint Services (see Figure 6 17). These settings limit the performance impact that this feature can have on the server hosting the PPS application.

This chapter took a thorough look at data binding. You learned how to create data binding expressions that draw information from custom objects and how to push changes back to the source. You also learned how to use change notification, bind entire collections of data, and get your records from a web service. Finally, you considered Silverlight s surprisingly capable all-in-one data control, the DataGrid.

Figure 6 17. Sample Show Details report The Initial retrieval limit limits the number of rows that can be retrieved on the first page of the details report. The default of 1,000 is generally sufficient without creating too great a load on the server. The Maximum retrieval limit is used to prevent excessively large datasets from being returned on subsequent pages of the report. You can either choose a fixed number of rows or leave control of this setting with Analysis Services. To reduce page load times and unnecessary server traffic, consider reducing this value to one in line with the expected use of the report.

// Create a new service object Service initiatorService = new Service("InitiatorService", cnn, tran); initiatorService.FetchSize = 1; // Begin a new dialog with the service TargetService Conversation dialog = initiatorService.BeginDialog( "TargetService", null, "http://ssb.csharp.at/SSB_Book/c05/HelloWorldContract", TimeSpan.FromMinutes(1), false, cnn, tran); // Create a new request message Message request = new Message( "http://ssb.csharp.at/SSB_Book/c05/RequestMessage", null); // Send the message over the new dialog dialog.Send(request, cnn, tran); // Commit the transaction, so that the message is really sent to the // other Service Broker service tran.Commit(); Console.WriteLine("Press Enter to Exit"); Console.ReadLine(); } catch (ServiceException ex) { Console.WriteLine("An exception occurred {0}\n", ex.ToString()); if (tran != null) tran.Rollback(); } finally { if (reader != null) reader.Close(); if (cnn != null) cnn.Close(); } } Figure 5-3 shows the output of this simple Service Broker client.

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