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Figure 2-19. Highlighting errors at design time Visual Studio won t flag your errors immediately. Instead, it will quickly scan through your code as soon as you try to compile it and mark all the errors it finds. If your code contains at least one error, Visual Studio will ask you whether it should continue. At this point, you ll almost always decide to cancel the operation and fix the problems Visual Studio has reported. (If you choose to continue, you ll actually wind up using the last compiled version of your application, because the .NET compilers can t build an application that has errors.)

Using the XML methods of the DataSet is quite straightforward, as you ll see in the next example This example uses two GridView controls on a page The first DataSet is filled directly from the Employees table of the Northwind database (The code isn t shown here because it s similar to what you ve seen in the previous chapters) The second DataSet is filled using XML Here s how it works: once the DataSet has been created, you can generate an XML schema file describing the structure of the DataSet and an XML file containing the contents of every row The easiest approach is to use the WriteXmlSchema() and WriteXml() methods of the DataSet These methods provide several overloads, including a version that lets you write data directly to a physical file.

GetPathRoot()

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You may find that as you fix errors and rebuild your project you discover more problems. That s because Visual Studio doesn t check for all types of errors at once. When you try to compile your application, Visual Studio scans for basic problems such as unrecognized class names. If these problems exist, they can easily mask other errors. On the other hand, if your code passes this basic level of inspection, Visual Studio checks for more subtle problems such as trying to use an unassigned variable.

When you write the XML data, you can choose between several slightly different formats by specifying an XmlWriteMode You can indicate that you want to save both the data and the schema in a single file (XmlWriteModeWriteSchema), only the data (XmlWriteModeIgnoreSchema), or the data with both the current and the original values (XmlWriteModeDiffGram) Here s the code that you need to save a DataSet to an XML file: string xmlFile = ServerMapPath("Employeesxml"); dsWriteXml(xmlFile, XmlWriteModeWriteSchema); This code creates an Employeesxml file in the current folder Now you can perform the reverse step by creating a new DataSet object and filling it with the data contained in the XML file using the DataSetReadXml() method as follows: DataSet dsXml = new DataSet("Northwind"); dsXmlReadXml(xmlFile); This completely rehydrates the DataSet, returning it to its original state.

HasExtension() IsPathRooted()

So far, you ve learned how to design simple web pages, and you ve taken a tour of the Visual Studio interface But before you get to serious coding, it s important to understand a little more about the underpinnings of the ASPNET code model In this section, you ll learn about your options for using code to program a web page and how ASPNET events wire up to your code Visual Studio supports two models for coding web pages and web services: Inline code: This model is the closest to traditional ASP All the code and HTML is stored in a single aspx file The code is embedded in one or more script blocks However, even though the code is in a script block, it doesn t lose IntelliSense or debugging support, and it doesn t need to be executed linearly (like classic ASP code).

If you want to see the structure of the generated Employeesxml file, you can open it in Internet Explorer, as shown in Figure 12-15 Notice how the first part contains the schema that describes the structure of the table (name, type, and size of the fields), followed by the data itself..

Although the Path class contains methods for drilling down the directory structure (adding subdirectories to directory paths), it doesn t provide any methods for going back up (removing subdirectories from directory paths). However, you can work around this limitation by using the Combine() method with the relative path .., which means move one directory up. For good measure, you can also use the GetFullPath() method on the result to return it to a normal form. Here s an example: Dim strPath As String = "c:\temp\subdir" strPath = Path.Combine(path, "..") ' path now contains the string "c:\temp\subdir\.." strPath = Path.GetFullPath(path) ' path now contains the string "c:\temp"

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