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These designers differ a bit based on which API you use (eg, Windows Forms, WPF, or ASPNET), but their overall functionality is similar You ll see examples of using these designers throughout this book, including some Windows Forms designers later in this chapter You won t need to author the numerous code statements to configure a data adapter fully at this time; instead, you can take a massive shortcut by implementing ConfigureAdapter() like this: private void ConfigureAdapter(out SqlDataAdapter dAdapt) { // Create the adapter and set up the SelectCommand dAdapt = new SqlDataAdapter("Select * From Inventory", cnString); // Obtain the remaining command objects dynamically at runtime // using the SqlCommandBuilder SqlCommandBuilder builder = new SqlCommandBuilder(dAdapt); } To simplify the construction of data adapter objects, each of the Microsoft-supplied ADONET data providers provides a command builder type.

When the client wants to communicate with another member server in the network, it first has to ask the KDC for a session ticket. For this purpose, it sends the locally cached TGT to a so-called ticket-granting service that runs on the KDC. This service validates the TGT, and if it s still valid (not expired, not tampered with, and so on), it generates a session key for the communication session between the client and the member server. This session key is then encrypted with the client s master key. In addition, the session key is packaged into an ST (session ticket), which contains additional expiration information for the server. This session ticket is encrypted with the member server s master key. Both the encrypted session key and the encrypted session ticket are forwarded to the client. The client decrypts the session key and forwards the session ticket to the server. Of course, both the server and the client are well known to the KDC, as somewhere in the past both have been joined to the domain (joining a machine to a domain means establishing a trust relationship between this machine and the KDC). Therefore, the KDC knows the client s and the member server s master keys.

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The SqlCommandBuilder automatically generates the values contained within the SqlDataAdapter s InsertCommand, UpdateCommand, and DeleteCommand properties, based on the initial SelectCommand The benefit here is that you do not need to build all the SqlCommand and SqlParameter types by hand Here s an obvious question at this point: how is a command builder able to build these SQL command objects on the fly The short answer is metadata When you call the Update() method of a data adapter at runtime, the related command builder will read the database s schema data to autogenerate the underlying insert, delete, and update command objects Obviously, doing so requires additional roundtrips to the remote database; this means it will hurt performance if you use the SqlCommandBuilder numerous times in a single application.

Here, you minimize the negative effect by calling your ConfigureAdapter() method at the time the InventoryDALDisLayer object is constructed, retaining the configured SqlDataAdapter for use throughout the object s lifetime In the previous code snippet, you did not use the command builder object (SqlCommandBuilder, in this case) beyond passing in the data adapter object as a constructor parameter As odd as this might seem, this is all you must do (at a minimum) Under the hood, this type configures the data adapter with the remaining command objects While you might love the idea of getting something for nothing, you should understand that command builders come with some critical restrictions Specifically, a command builder is only able to autogenerate SQL commands for use by a data adapter if all of the following conditions are true:.

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