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What is unique about the sample code is that the foreach statement works and happens to know that the objects in the collection are of type Example. However, the following code adds a different object to the collection, which will cause the iteration to fail. class Another { } IList objects = new ArrayList(); objects.Add(new Example { Value = 10 }); objects.Add(new Example { Value = 20 }); objects.Add(new Another()); foreach (Example obj in objects) { Console.WriteLine("Object value (" + obj.Value + ")"); } The bolded code illustrates how the collection object contains two instances of Example and one instance of Another. The code will compile, which misleads you into believing everything is fine. If you try to run the application (either normally or in debug mode), you will see the following: Unable to cast object of type 'Another' to type 'Example'. So, should a collection contain multiple types There are arguments for and against the idea, but the problem is not the ability to mix types. The problem is that you can mix types, even if you don t really intend to do that. Using the foreach keyword with mixed types will result in an exception, because for each iteration, the object in the collection is cast to a type Example. As the last item in the collection is of type Another, the cast will fail, and an exception will be generated. Collections before .NET 2.0 could not enforce type consistency, and that was a problem. Had you desired to mix types, the proper foreach loop would have been as follows: foreach (object obj in objects) { if( obj is Example) { // ... } else if( obj is Another) { // ... } }

Then we return the transformed URL string: // change all dashes, underscores and spaces to dashes urlText = dashesRegexReplace(urlText, "-"); // return the modified string return urlText; } PrepareUrlText is used by ToDepartment, ToCategory, and ToProduct to create product URLs These methods also use the HttpUtilityUrlPathEncode function to ensure that no unaccepted characters appear in the final URLs Using UrlPathEncode is a good programming practice when creating URLs Make sure all the links in your site are now search engine friendly, and let s move on to the next task for this chapter..

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Another issue with pre-C# 20 collections is that they have performance problems Consider the following code that manipulates value types IList objects = new ArrayList(); objectsAdd(1); objectsAdd(2); foreach (int val in objects) { ConsoleWriteLine("Value (" + val + ")"); } In the example, an ArrayList is again instantiated, but this time, the numbers 1 and 2 are added to the collection Then, in the foreach statement, the integers are iterated The code works, but there is a hidden performance hit The items added to the collection are value types, which means you are manipulating stack-based memory.

To create a two-variable data table in Excel, follow these steps: 1. In a cell on the worksheet, enter the formula that refers to the two input cells. 2. Type one list of input values in the same column, below the formula. 3. Type the second list in the same row, to the right of the formula. 4. Select the range of cells that contains the formula and both the row and column of values. 5. Click Data Table. 6. In the Row Input Cell box, click or type the reference to the input cell for the input values in the row. 7. In the Column Input Cell box, click or type the reference to the input cell for the input values in the column. 8. Click OK.

With our current code, loading any of the following URLs in a web browser will get the same content the product page of our Welcome Back balloon: http://wwwexamplecom/Welcome-Back-p33/ http://wwwexamplecom/TYPO-p33/ http://wwwexamplecom/Productaspx ProductID=33 This flexibility happens to have potentially adverse effects on your search engine rankings If, for any reason, the search engines reach the same page using different links, they might think you have lots of different pages with identical content on your site and may incorrectly assume that you have a spam site or a site with low density of unique content In such an extreme case, your site as a whole, or just parts of it, may be penalized and not get the best possible location in SERPs (Search Engine Result Pages).

However, the definition of IList uses objects: public interface IList : ICollection, IEnumerable { // Methods int Add(object value); void Clear(); bool Contains(object value); int IndexOf(object value); void Insert(int index, object value); void Remove(object value); void RemoveAt(int index); // Properties bool IsFixedSize { get; } bool IsReadOnly { get; } object this[int index] { get; set; } } How IList is defined and how a value type is defined should raise alarms An object is a reference type, and thus you have a conflict: IList stores reference types, but int is a value type What s happening is that the NET environment knows that there is a conflict and adds a fix Don t think of the fix as a hack, but as a way of solving a problem that all virtual machine environments like NET need to address The .

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