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$this->mTotalAmountLabel = ShoppingCart::GetTotalAmount(); $this->mContinueShopping = $_SESSION['page_link']; $this->mCustomerData = Customer::Get(); // We allow placing orders only if we have complete customer details if (empty ($this->mCustomerData['credit_card'])) { $this->mOrderButtonVisible = 'disabled="disabled"'; $this->mNoCreditCard = 'yes'; } else { $this->mPlainCreditCard = Customer::DecryptCreditCard( $this->mCustomerData['credit_card']); $this->mCreditCardNote = 'Credit card to use: ' . $this->mPlainCreditCard['card_type'] . '<br />Card number: ' . $this->mPlainCreditCard['card_number_x']; } if (empty ($this->mCustomerData['address_1'])) { $this->mOrderButtonVisible = 'disabled="disabled"'; $this->mNoShippingAddress = 'yes'; } else { $shipping_regions = Customer::GetShippingRegions(); foreach ($shipping_regions as $item) if ($item['shipping_region_id'] == $this->mCustomerData['shipping_region_id']) $this->mShippingRegion = $item['shipping_region']; } } } > 3. Create the checkout_not_logged.tpl file in the presentation/templates folder, and add the following code: {* checkout_not_logged.tpl *} <h3> You must be logged in to CHECKOUT <br /> If you don't have an account please register <br /> </h3>

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The IsDefined method is frequently used for parameter validation . Here s an example:

$child $child $value $value $child $child $value $value $child $child $value $value $child $child $value $value $child $child $value $value $child $child $value $value

Figure B-1: The results of displaying the HTML from Listing B-1 in Microsoft Internet Explorer Figure B-2: The results of displaying the HTML from Listing B-2 in Internet Explorer, using a table to format the form

When CompanyB attempts to compile its code, the C# compiler issues the following warning: warning CS0108: The keyword new is required on BetterPhone.Dial() because it hides inherited member Phone.Dial() . This warning is notifying the developer that BetterPhone is defining a Dial method, which will hide the Dial method defined in Phone. This new method could change the semantic meaning of Dial (as defined by CompanyA when it originally created the Dial method). It s a very nice feature of the compiler to warn you of this potential semantic mismatch. The compiler also tells you how to remove the warning by adding the new keyword before the definition of Dial in the BetterPhone class. Here s the fixed BetterPhone class:

SET @i2 = N'(1:5)'; SELECT CAST(@i1.ToString() AS CHAR(8)) AS i1, CAST(@i2.ToString() AS CHAR(8)) AS i2, @i1.Equals(@i2) AS [Equals]; PRINT 'Testing Before and After operators'; SET @i2 = N'(7:10)'; SELECT CAST(@i1.ToString() AS CHAR(8)) AS i1, CAST(@i2.ToString() AS CHAR(8)) AS i2, @i1.Before(@i2) AS [Before], @i1.After(@i2) AS [After]; PRINT 'Testing Includes and Properly Includes operators'; SET @i2 = N'(3:5)'; SELECT CAST(@i1.ToString() AS CHAR(8)) AS i1, CAST(@i2.ToString() AS CHAR(8)) AS i2, @i1.Includes(@i2) AS [i1 Includes i2], @i1.ProperlyIncludes(@i2) AS [i1 Properly Includes i2]; SET @i3 = N'(1:5)'; SELECT CAST(@i1.ToString() AS CHAR(8)) AS i1, CAST(@i3.ToString() AS CHAR(8)) AS i3, @i1.Includes(@i3) AS [i1 Includes i3], @i1.ProperlyIncludes(@i3) AS [i1 Properly Includes i3]; PRINT 'Testing Meets operator'; SET @i2 = N'(6:6)'; SELECT CAST(@i1.ToString() AS CHAR(8)) AS i1, CAST(@i2.ToString() AS CHAR(8)) AS i2, @i1.Meets(@i2) AS [Meets]; PRINT 'Testing Overlaps operator'; SET @i2 = N'(3:6)'; SELECT CAST(@i1.ToString() AS CHAR(8)) AS i1, CAST(@i2.ToString() AS CHAR(8)) AS i2, @i1.Overlaps(@i2) AS [Overlaps]; PRINT 'Testing Begins and Ends operators'; SET @i2 = N'(1:7)'; SELECT CAST(@i1.ToString() AS CHAR(8)) AS i1, CAST(@i2.ToString() AS CHAR(8)) AS i2, @i1.Begins(@i2) AS [Begins], @i1.Ends(@i2) AS [Ends]; PRINT 'Testing NULLs'; SET @i3 = NULL; SELECT CAST(@i3.ToString() AS CHAR(8)) AS [Null Interval]; IF @i3 IS NULL SELECT '@i3 IS NULL' AS [IS NULL Test]; GO

Run the following code to simulate another day s worth of order activity (April 19, 2008):

using System; using System.Runtime.CompilerServices; public sealed class SomeType { // Define a get_Item accessor method. public Int32 this[Boolean b] { get { return 0; } } // Define a get_Jeff accessor method. [IndexerName("Jeff")] public String this[Boolean b] { get { return null; } } }

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{ // Import type mapping information XmlReflectionImporter importer = new XmlReflectionImporter(); XmlTypeMapping map = importer.ImportTypeMapping(type); // Generate the assembly and add it to // the cache for that type tempAssembly = GenerateTempAssembly(map); Cache.Add(type, tempAssembly); } } The XmlSerializer class maintains an internal table of type/assembly pairs. If no known assembly exists to handle the type, a new assembly is promptly generated and cached; otherwise, the existing assembly is used to serialize and deserialize. (More on the assembly's contents in the next section.) Each instance of the XmlSerializer class maintains a reference to the assembly to be used for reading and writing operations. In the preceding pseudocode, tempAssembly is the name of this data member. Both the Serialize method and the Deserialize method use this reference to obtain the tailor-made reader and writer objects to work on the particular type. The Assembly Cache The assembly cache is built around a hash table that contains objects of type TempAssembly. As the ILDASM shows in Figure 11-4, the assembly cache corresponds to a class named TempAssemblyCache. The XmlSerializer class holds a static TempAssemblyCache member that is shared by all instances of the XmlSerializer you might create.

Figure 3-3