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In some situations, workflows can sensibly make use of transient resources such as files. The tricky thing is that you still want to be careful about closing and disposing of resources when the workflow is complete or when it is no longer being used. For this reason, the workflow type must be carefully designed to correctly dispose of resources halfway through a computation if necessary. Sequence expressions are a great example where this is useful. For example, the following sequence expression opens a file and reads lines on demand: let linesOfFile(fileName) = seq { use textReader = System.IO.File.OpenText(fileName) while not textReader.EndOfStream do yield textReader.ReadLine() } We discussed the construct use pat = expr in 8. As shown in Table 9-2, you can also use this construct within workflows. In this case, the use pat = expr construct de-sugars into a call to seq.Using. In the case of sequence expressions, this function is carefully implemented to ensure that textReader is kept open for the duration of the process of reading from the file. Furthermore, the Dispose function on each generated IEnumerator object for a sequence calls the textReader.Dispose() method. This ensures that the file is closed even if we enumerate only half of the lines in the file. Workflows thus allow you to scope the lifetime of a resource over a delayed computation.

The real work of data binding at runtime is handled by the CslaDataSourceView. ASP.NET gets a reference to this object through CslaDataSource, but it is this object that actually interacts with the data source. The object maintains a reference to the CslaDataSource control that created it, along with the assembly name and type name of the business object to which it is bound: public class CslaDataSourceView : DataSourceView { private CslaDataSource _owner; private string _typeName; private string _typeAssemblyName; } The class inherits from System.Web.UI.DataSourceView, and so is required (at a minimum) to override the ExecuteSelect() method. It also overrides ExecuteInsert(), ExecuteUpdate(), and ExecuteDelete(). ASP .NET calls these methods to trigger the appropriate operation at the appropriate time. For instance, when a control s data binding requires data, ASP .NET invokes the ExecuteSelect() method, and when data is to be inserted, it invokes the ExecuteInsert() method.

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Like functions, workflow expressions can be defined recursively. Many of the best examples are generative sequences. For example: let rnd = System.Random() let rec randomWalk k = seq { yield k yield! randomWalk (k + rnd.NextDouble() - 0.5) } > randomWalk 10.0;; val it: seq<float> = seq [10.0; 10.23817784; 9.956430122; 10.18110362; ...] > randomWalk 10.0;; val it : seq<float> = seq [10.0; 10.19761089; 10.26774703; 9.888072922; ...]

Business objects provide an abstract representation of entities or concepts that are part of the business or problem domain.

You can alter these scripts if you like. For example, instead of displaying the source of quoted text with each blockquote, you could display all of the sources as a list at the end of the document, just like footnotes. Also, you could indicate which access key has been assigned to a link by appending the access key directly to the link text. Following the pattern described in this chapter, you can write useful scripts. For example, you could create a table of contents for a document. Loop through all the h1 or h2 elements in a document and put them into a list. Attach that list to the start of the document. You could even make each item in the list an internal link to the corresponding header. You can create useful scripts like these using just a handful of DOM methods and properties. Having well-structured markup is an important prerequisite when you are enhancing content with DOM scripts. As a recap, these are the most useful methods for retrieving information from a document: getElementById getElementsByTagName getAttribute These are the most useful methods for attaching information to a document: createElement createTextNode appendChild insertBefore setAttribute By combining those methods, you can create very powerful DOM scripts. Always remember to use JavaScript to enhance the content of your documents, rather than creating any core content directly with the DOM.

I ve already discussed the drawbacks of putting business logic into the UI tier, but I haven t thoroughly discussed the drawback of keeping the data in a generic representation such as a DataSet object The data in a DataSet (or an array or XML document) is unintelligent, unprotected, and generally unsafe There s nothing to prevent anyone from putting invalid data into any of these containers, and there s nothing to ensure that the business logic behind one form in the application will interact with the data in the same way as the business logic behind another form A DataSet or an XML document with an XSD (XML Schema Definition) might ensure that text cannot be entered where a number is required, or that a number cannot be entered where a date is required At best, it might enforce some basic relational-integrity rules.

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