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Once more, we ll look to the world of the Internet for an illustration. The Observer pattern leads us to blogs, which are web sites where people write about technical topics, their travels, their lives, and so on. Each blog site is maintained by a single blogger. People who come to read about the information put out by a blogger and find it interesting can subscribe to be informed each time a new blog entry is posted. Bloggers don t always post regularly; days or weeks might go by between entries. Therefore, it is more efficient for the blogger to alert interested parties rather than for those parties to constantly poll the blog site. Figure 9-8 shows a typical blog site. On the right is an Email alerts link. In terms of the Observer pattern, those who wish to observe what is going on can click on this link to sign up to be alerted whenever there is a change on the site.

#define FOREVER ... FOREVER { ... } for (;;)

Boolean found = false; Int32 x = 100 + 20 + 3; String s = "a " + "bc"; // Generated code sets found to 0 // Generated code sets x to 123 // Generated code sets s to "a bc"

using using using using System; System.Collections.Generic; System.Linq; System.Text;

private static int GetCharacterCount(string myString) { try { char[] cArray = myString.ToCharArray(); int index = 0; while (index < cArray.Length) { index++; } return index; } catch (ArgumentOutOfRangeException) { throw; } }

In this practice, you create an AJAX client control that works with a text box DOM element to show users their password strength. In Exercise 2, you add this control to a webpage and wire it to a text box. This same control is used in Practice 3, in which you wrap the control as a custom server control.

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Figure 5-7 : ValidatorTest.aspx, which uses the RangeValidator, RegularExpressionValidator, and CustomValidator controls The RangeValidator control has several attributes that are unique to this type of validator. In Listing 5-4, the code that declares RangeValidator is as follows: <ASP:RangeValidator ID="ValRange" ControlToValidate="Range" Display="Static" Type="Integer" MinimumValue="1" MaximumValue="12" ErrorMessage="Out of Range" runat=server /> Three of the attributes used here are already familiar (ControlToValidate, Type, and RunAt), one has been shown previously but not explained (Display, to be described in the next section), and a couple are new (MinimumValue and MaximumValue). Type is the type of comparison that should be done. For example, consider whether 1234 is greater than 13. If these are string values, 1234 is alphabetically smaller, but if these are numeric values, 1234 is numerically greater. The values allowed for Type in RangeValidator are the same as are allowed for a CompareValidator control s Type attribute. MinimumValue and MaximumValue are compared to the value of ControlToValidate, using the type conversion specified by the Type attribute. In this example, we re looking for an integer from 1 through 12. RegularExpressionValidator is useful because of its flexibility. The code used to specify RegularExpressionValidator in Listing 5-4 is shown here: <ASP:RegularExpressionValidator ID="ValRegEx" ControlToValidate="RegEx" runat="SERVER" ErrorMessage="Enter a valid U.S. SSN (nnn-nn-nnnn)." ValidationExpression="[0-9]{3}-[ 0-9]{2}-[0-9]{4}" /> The unique attribute in the code to create this validator is ValidationExpression. The value of this attribute is a regular expression pattern to match against the value of the control specified in ControlToValidate. If you re unfamiliar with regular expressions in general, refer to the following Regular Expressions sidebar.

When the content is in place, we can configure a new website in the IIS Manager by clicking Add Web Site, as shown in figure 6.2. In the Add Web Site dialog box that comes up, we need to configure the following:

Table 2-5 shows an example of a version number: 2 .5 .719 .2 . The first two numbers make up the public perception of the version . The public will think of this example as version 2 .5 of the assembly . The third number, 719, indicates the build of the assembly . If your company builds its assembly every day, you should increment the build number each day as well . The last number, 2, indicates the revision of the build . If for some reason your company has to build an assembly twice in one day, maybe to resolve a hot bug that is halting other work, the revision number should be incremented . Microsoft uses this version-numbering scheme, and it s highly recommended that you use this scheme as well . Future versions of the CLR will offer better support for loading new versions of an assembly and for rolling back to a previous version of an assembly if a new version actually breaks an existing application . To accomplish this versioning support, the CLR will expect that a version of an assembly that fixes one or more bugs will have the same major/minor version, and the build/revision numbers will indicate a servicing version containing the update(s) . When loading an assembly, the CLR will automatically find the latest installed servicing version that matches the major/minor version of the assembly being requested . You ll notice that an assembly has three version numbers associated with it . This is very unfortunate and leads to a lot of confusion . Let me explain each version number s purpose and how it is expected to be used:

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