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role-based security, and storage, without forcing you to reimplement a similar feature from scratch. To access ASP.NET features in a web service, you use the static Current property of the System.Web.HttpContext class. HttpContext represents the HTTP environment that hosts your service. It provides access to key ASP.NET objects through its properties, such as Session (the per-user session state), Application (the global application state), Cache (the data cache), Request (the HTTP request message, including HTTP headers, client browser details, cookies, the requested URL, and so on), User (the user making the request, if authenticated through ASP.NET), and so on. ASP.NET developers will be familiar with these details. The following example uses HttpContext to get access to the data cache. It caches a collection of Product objects so the database doesn t have to be queried each time the web service method is called: [OperationContract] public Product[] GetAllProducts() { // Check the cache. HttpContext context = HttpContext.Current; if (context.Cache["Products"] != null) { // Retrieve it from the cache return (Product[])context.Cache["Products"]; } else { // Retrieve it from the database. Product[] products = QueryProducts(); // Now store it in the cache for 10 minutes. context.Cache.Insert("Products", products, null, DateTime.Now.AddMinutes(10), TimeSpan.Zero); return products; } } // This private method contains the database code. private Product[] QueryProducts() { ... } The actual caching feature (and other ASP.NET features) is outside of the scope of this book. However, this example shows how experienced ASP.NET developers can continue to use some of the features of ASP.NET when building a WCF service. To try an example of ASP.NET caching in a web service, check out the downloadable examples for this chapter.

Note For more information about ASP.NET platform services like caching and authentication, refer to Pro ASP.NET 3.5 in C# 2008 (Apress, 2008).

--Multiple inserts using row constructors INSERT INTO @DateRecords VALUES(7,'1/7/2008'), (8,'1/8/2008'), (9,'1/9/2008') --Display INSERT results SELECT * FROM @DateRecords

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These factors can be either positive or negative. A factor such as time/money saved is a positive one; the more time saved, the better. You can also use negative factors such as required development or risk. Requirements that take more effort to implement would lower their overall score. This approach allows you to identify the low-hanging fruit; the items that have a big impact with relatively little effort. The first step in this process is to decide on what factors work for you. When evaluating a requirement, what things about it would increase (or decrease) its importance Ultimately, these should measure how implementing this requirement will help your organization fulfill its mission statement or operational objectives. Each factor should be assigned a relative weight, as some will have a bigger impact than others. I recommend using scale from 10 to 10 and assign the negative factors a negative

scrollable, and the Grid that lays out items in discrete rows. For this reason, the only practical way to use the VisualTreeHelper is with recursive code in essence, you keep digging through the tree until you find the type of element you re interested in, and then you act on it. The following example uses this technique to clear all the text boxes in a hierarchy of elements:

Table-valued parameters are exposed through the new user-defined table type in SQL Server 2008. Table-valued parameters provide an easy way to pass an entire dataset or table to functions and procedures. This prevents you from having to loop through a dataset calling a stored procedure multiple times for each row in the dataset. Following are some of the benefits from using table-valued parameters:

private void Clear(DependencyObject element) { // If this is a text box, clear the text. TextBox txt = element as TextBox; if (txt != null) txt.Text = ""; // Check for nested children. int children = VisualTreeHelper.GetChildrenCount(element); for (int i = 0; i < children; i++) { DependencyObject child = VisualTreeHelper.GetChild(element, i); Clear(child); } }

weight. The most important positive factor should be given a 10 and all other factors should then be assigned a weight based on their relative importance.

To set it in motion, call the Clear() method with the topmost object you want to examine. Here s how to dissect the entire current page:

Alas, most good things come with a price. When you use table-valued parameters, keep the following restrictions in mind:

Clear(this);

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