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Here s a surprise for you: there is no imperative need for .NET generics, so you could skip this chapter and read the next one, right Wrong. I could just as easily have said there is no need for C# properties, nor any other C# construct that enriches your programming abilities. The reasons we have C# properties and .NET generics are programming elegance and expressiveness. To understand what I am trying to get at, consider this sentence: Ducks walk flat feet quack loud Reading the sentence, you get an idea of what is being said, but you are not completely sure. C# without .NET generics is like this sentence, in that you express your ideas in code, but some things are not as clear as you would like. C# with .NET generics is like this sentence: Ducks walk in a funny manner due to their flat feet, and when they quack, it is very loud. The sentence is clearer and uses more words to describe the same thing. The reason we talk using a more sophisticated language is that we want to explain concepts and be understood. If you accept that, then you can accept why there is a need and context for .NET generics. And if not, feel free to skip this chapter and read the next one. An example that illustrates how using .NET generics makes your code clearer, as well as more concise, than code that does not use .NET generics is a container. A container is a type that is used to manage other types; lists and collections are examples of containers. To keep

1. Modify the Link class in the Link.cs file by adding the following method: // 301 redirects to correct product URL if not already there public static void CheckProductUrl(string productId) { // get requested URL HttpContext context = HttpContext.Current; string requestedUrl = context.Request.RawUrl; // get last part of proper URL string properUrl = Link.ToProduct(productId); string properUrlTrunc = properUrl.Substring(Math.Abs (properUrl.Length requestedUrl.Length)); // 301 redirect to the proper URL if necessary if (requestedUrl != properUrlTrunc) { context.Response.Status = "301 Moved Permanently"; context.Response.AddHeader("Location", properUrl); } } 2. Modify the Page_Load function in Product.aspx.cs by adding a call to Link.CheckProductUrl: protected void Page_Load(object sender, EventArgs e) { // Retrieve ProductID from the query string string productId = Request.QueryString["ProductID"]; ... // 301 redirect to the proper URL if necessary Link.CheckProductUrl(Request.QueryString["ProductID"]); } 3. Load http://www.example.com/TYPO-p33/ and notice that page redirects to http://www. example.com/Welcome-Back-p33/. Using a tool such as the LiveHTTPHeaders Firefox extension (http://livehttpheaders.mozdev.org/), you can see the type of redirect used was 301 (see Figure 7-7).

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1. Select cells A2 through B7. 2. Click Data Table. 3. Click the Column Input Cell box, and then click cell B1. 4. Click OK. Compare your results with Figure A-3.

things simple, let s look at a container that manages a single reference The following is the less concise version that uses the object type public class Container { object _managed; public Container(object toManage) { _managed = toManage; } public object Managed { get { return _managed; } } } In the code, the class Container has a constructor with a parameter and a single property, Managed, which references the variable _managed The idea behind this class is to assign an object in the constructor that can be referenced using the property The class Container does not know what the variable _managed does or its capabilities Container does not care, because Container is acting like a basket that holds an instance of whatever is given to it The Container class could be used as follows: Container container = new Container(new MyType()); (containerManaged as MyType).

The code follows some simple logic to get the job done. The CheckProductUrl method of the Link class verifies if a request should be redirected to another URL, and if so, it does a 301 redirection. The ASP.NET way of performing the redirection is by setting the HTTP header like this: // 301 redirect to the proper URL if necessary if (requestedUrl != properUrl) { context.Response.Status = "301 Moved Permanently"; context.Response.AddHeader("Location", properUrl); } Note that in case you extend the automatic URL correction functionality in your site, it would be appropriate to create a new class to deal with it, and move CheckProductUrl to that class.

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