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Django s forms, like its models, use a declarative syntax where fields are assigned as attributes to the form s class definition. This is one of the most identifiable features of Django, and is used to great effect here as well. It allows a form to be declared as just a simple class while supplying a great deal of additional functionality behind the scenes. The first difference between models and forms is how they recognize fields. Models don t actually recognize fields at all; they just check to see if an attribute has a method and call it, regardless of what type of object it s attached to. Forms do actually check the type of each attribute on the class to determine if it s a field, looking specifically for instances of . Like models, forms keep a reference to all the fields that were declared, though forms do so a bit differently. There are two separate lists of fields that may be found on a form, depending on what stage it s in, each with its own purpose.

You can store global application variables in one other way. You can add static member variables to the global.asax file (which was introduced in 5). These members are then compiled into the custom HttpApplication class for your web application and made available to all pages. Here s an example: public static string[] fileList;

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The key detail that allows this to work is that the variable is static That s because ASPNET creates a pool of HttpApplication classes to serve multiple requests As a result, each request might be served with a different HttpApplication object, and each HttpApplication object has its own instance data However, there is only one copy of the static data, which is shared for all instances Another requirement is that you must supply the ClassName attribute in the Application directive This assigns a name to the global application class, which you ll need to use to retrieve the static value you ve just created Of course, for the best encapsulation (and the most flexibility), you should use property procedures: private static string[] fileList; public static string[] FileList { get { return fileList; } } When you add a member variable to the global.

asax file, it has essentially the same characteristics as a value in the Application collection In other words, you can use any NET data type, the value is retained until the application domain is restarted, and state isn t shared across computers in a web farm However, there s no automatic locking Because multiple clients might try to access or modify a value at the same time, you should use the C# lock statement to temporarily restrict the variable to a single thread Depending on how your data is accessed, you might perform the locking in the web page (in which case you could perform several tasks at once with the locked data) or in the property procedures or methods in the globalasax file (in which case the lock would be held for the shortest possible time).

The first, , is a list of all the fields that were found when the metaclass executed. These are stored on the form class itself, and are available to all instances as well. Thus, this list should only be edited in extreme circumstances, as doing so would affect all future instances of the form. It s always useful as a reference when looking at a form class itself or when identifying those fields that were actually declared directly on the class. All form instances also get a attribute, which contains those fields that will actually be used to generate the HTML for the form, as well as validate user input. Most of the time, this list will be identical to , since it starts as just a copy of it. Sometimes, however, a form will need to customize its fields based on some other information, so that individual instances will behave differently in different situations. For example, a contact form may accept a object to determine whether the user is logged in or not. If not, the form can add another field to accept the user s name.

Here s an example of property procedure that maintains a thread-safe global collection of metadata: private static Dictionary<string, string> metadata = new Dictionary<string, string>(); public void AddMetadata(string key, string value) { lock (metadata) { metadata[key] = value; } } public string GetMetadata(string key) { lock (metadata) { return metadata[key]; } } Using static member variables instead of the Application collection has two advantages First, it allows you to write custom code in a property procedure You could use this code to log how many times a value is being accessed, to check if the data is still valid, or to re-create it Here s an example that uses a lazy initialization pattern and creates the global object only when it s first requested: private static string[] fileList; public static string[] FileList { get { if (fileList == null) { fileList = DirectoryGetFiles(.

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