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ASP provided little direct support for form validation, and thus you were free to do pretty much as you pleased. Even within the same development group, you can generally find one or more models for accepting and validating input. I m sorry to report that even within a single developer s code, you might find more than one structure for handling form validation (at least if I m the developer in question ). Every HTML form has an action attribute in the <FORM> tag that points to a URL. The URL can be absolute, beginning with http://, or relative, perhaps beginning with a slash (/) to refer to the root of the current site, or just a file name that must exist in the same folder as the page the form is in. When the form is submitted, the contents of the form are sent to the URL referred to by the action attribute of the <FORM> tag. The two common ASP structures are shown in Figures 5-1 and 5-2.

Table 4-4: Writing Methods of the XmlWriter Class Method Description valid name according to the W3C XML 1.0 recommendation. Writes the specified name, ensuring that it is a WriteNmToken valid NmToken according to the W3C XML 1.0 recommendation. Writes a processing instruction using the WriteProcessingInstruction required syntax < name value >. WriteQualifiedName Writes the namespace-qualified name after looking up the prefix that is in scope for the specified namespace. Writes the start of an attribute. Switches the writer's state to Attribute. Writes the declaration. XML 1.0 standard prolog

Now that you ve been introduced to the seven deadly sins, let s dig into them to understand what they mean and how you can counteract them with the good guidelines. We ll paraphrase Usman s explanations of the seven deadly sins.

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Figure 5-2 : Another possible ASP structure for form validation The ASP structure in Figure 5-1 has a form in Default.asp with the action attribute of the <FORM> tag pointing to AcceptData.asp. The job of AcceptData.asp is to validate the information in the form from Default.asp and then return the user to Default.asp to correct some information, process the information and then display a status message, or redirect the user to another page. The ASP structure in Figure 5-2 has a form in Default.asp with the action attribute of the <FORM> tag pointing to Default.asp. This page is self-referencing, meaning that the information entered in the form will be posted back to the same page the form is on, and the page should allow different behaviors based on whether this is the first time the form is displayed or this is a postback . A postback occurs when a form is filled in and the submit button is clicked. There are several ways to detect whether a postback is in progress, but my preferred method is to have a hidden field in the form, named postback . The structures shown in Figures 5-1 and 5-2 both have advantages, but I generally prefer the structure shown in Figure 5-2, for the following reasons: All logic for a given form is located in a single place. If you need to add or delete a control in the form, all logic to handle it should be in one page.

Writes the specified start tag for the specified element node. Writes the specified text contents. Can be used with open attributes or element nodes. Writes the specified white space.

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Some of these methods are abstract; some are not. In particular, the XmlWriter class provides an implementation for one-shot methods that group a few more basic calls. For example, WriteAttributeString is implemented in XmlWriter like this: public void WriteAttributeString(string localName, string value) { WriteStartAttribute(null, localName, null); WriteString(value); WriteEndAttribute(); } Other, more specialized, writing methods available in the XmlWriter interface are listed in Table 4-5. Table 4-5: Miscellaneous Writing Methods Method Description Writes all the attributes found at the current WriteAttributes position in the specified XmlReader object. This method is actually implemented in XmlWriter. (This method will be discussed in more detail in the section "A Read/Write XML Streaming Parser," on page 179.) Encodes the specified binary bytes as base64 WriteBase64 and writes out the resulting text. (Base64 encoding is designed to represent arbitrary byte 117

No redirect is required to allow the user to correct an error This is also an advantage in cases where the user interface needs to be refreshed based on information entered by the user in a first pass For instance, in a recent hospital registration system I worked on, the user admitting a patient would first select the patient service, and then based on whether the service was for an inpatient or an outpatient, when the user submitted the form, the form would be refreshed with an additional control where the room and bed could be specified When an error occurs, all the information passed doesn t need to be reconstructed for the redirection back to the original page Commonly, when the postback succeeds and the information entered is valid, the information is processed and the user is redirected to another page.

Throughout this book, we ve looked at MSBuild. Have you enjoyed spelunking into the XML that makes MSBuild run We didn t think so. You may think it would be easier to wrap MSBuild in a cool PowerShell or Python script and have it call MSBuild multiple times. The problem is, you re not letting MSBuild do the things it does best, such as comparing timestamps on files and dealing with dependencies. MSBuild is designed to understand what you want to happen, and then go back and figure out how to do it. When externally scripted, you make multiple calls to MSBuild. You re telling it not only what you want, but how to get there. This causes unnecessary serialization. The external script is at the top of the process, not MSBuild. You want MSBuild to drive the actual compile, not have some external script do it. There are two ways to fix this. First, you can remove the external scripts and put MSBuild back at the top. But this approach can lead to monoliths, where you have one big job; or it can create bad dependencies. These are two of the seven deadly sins. Don t have a single target in the MSBuild script; use multiple targets to break things up. The second approach is a much better solution. It s called separation of powers. Don t have MSBuild do everything for you; if you need to do some setup work, such as checking out code or cleaning up folders from a previous build, do so outside of your MSBuild script. If you ve followed us through this book, that s exactly what we ve done. Now that the first sin has been resolved, let s look at the second: targets with side effects.

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