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As our business and supply chains become more and more connected and as online retailing attempts to go the next level, it becomes more and more of a challenge to connect systems and federate identity Identity on the Web is a challenge that needs to be addressed now With the challenges coming from phishing, password fatigue, and the need for federation, growth will be stunted and potentially decrease if identity is not addressed now The good news is that as an industry we ve been here before It wasn t all that long ago that there were challenges with networking There was a time when those writing applications had to make an up-front commitment to a particular networking stack This lack of interoperability injected costly rewrites if a company needed to move from one stack to another and had the potential to stunt overall growth of connected systems.

methods, it becomes much more difficult to access different instances of the Store database in different back-end data stores. Ultimately, the third option is the most flexible. It preserves the switchboard design by forcing all the windows to work through a single property. Here s an example that makes an instance of StoreDB available through the Application class: public partial class App : System.Windows.Application { private static StoreDB storeDB = new StoreDB(); public static StoreDB StoreDB { get { return storeDB; } } } In this book, we re primarily interested with how data objects can be bound to WPF elements. The actual process that deals with creating and filling these data objects (as well as other implementation details, such as whether StoreDB caches the data over several method calls, whether it uses stored procedures instead of inline queries, whether it fetches the data from a local XML file when offline, and so on) isn t our focus. However, just to get an understanding of what s taking place, here s the complete code: public class StoreDB { private string connectionString = Properties.Settings.Default.StoreDatabase; public Product GetProduct(int ID) { SqlConnection con = new SqlConnection(connectionString); SqlCommand cmd = new SqlCommand("GetProductByID", con); cmd.CommandType = CommandType.StoredProcedure; cmd.Parameters.AddWithValue("@ProductID", ID); try { con.Open(); SqlDataReader reader = cmd.ExecuteReader(CommandBehavior.SingleRow); if (reader.Read()) { // Create a Product object that wraps the // current record. Product product = new Product((string)reader["ModelNumber"], (string)reader["ModelName"], (decimal)reader["UnitCost"], (string)reader["Description"] , (string)reader["ProductImage"]); return(product); } else { return null; } }

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The view must not call methods directly on the model or even bind to data on the model. All interaction must be delegated through the ViewModel. Do not reference the model assembly from the view. The view must not compute values manually, even if it uses the ViewModel to retrieve the inputs. The computation must be pushed back into the ViewModel (for view-specific calculations) or into the model and subsequently exposed by the ViewModel. This extends to the comparison of values that are exposed by the ViewModel. The data exposed by the model must not include formatting information string.Format and such must be saved for the ViewModel or even the view.

finally { con.Close(); } } }

Note Currently, the GetProduct() method doesn t include any exception handling code, so all exceptions will

bubble up the calling code. This is a reasonable design choice, but you might want to catch the exception in GetProduct(), perform cleanup or logging as required, and then rethrow the exception to notify the calling code of the problem. This design pattern is called caller inform.

The industry recognized this was an issue that needed to be solved, and we now use TCP/IP for networking, providing the ability to work with Token Ring, Ethernet, X25, and Frame Relay The industry stepped up to the challenge before, and the industry is stepping up to solve the challenge now This chapter discusses the lessons learned from past attempts at solving the identity challenge, reviews the laws that were defined based on those lessons learned, and finishes with a review of an identity metasystem based on those laws..

The data object is the information package that you plan to display in your user interface. Any class works, provided it consists of public properties (fields and private properties aren t supported). In addition, if you want to use this object to make changes (via two-way binding), the properties cannot be read-only. Here s the Product object that s used by StoreDB: public class Product { private string modelNumber; public string ModelNumber { get { return modelNumber; } set { modelNumber = value; } } private string modelName; public string ModelName { get { return modelName; } set { modelName = value; } } private decimal unitCost; public decimal UnitCost { get { return unitCost; } set { unitCost = value; } } private string description; public string Description { get { return description; }

set { description = value; } } public Product(string modelNumber, string modelName, decimal unitCost, string description) { ModelNumber = modelNumber; ModelName = modelName; UnitCost = unitCost; Description = description; } }

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