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The shell either sets or uses more than 80 variables. Many of these are used by bash internally and are of little use to shell programmers. Others are used in debugging, and some are in common use in shell programs. About half are set by the shell itself, and the rest are set by the operating system, the user, the terminal, or a script. Of those set by the shell, you have already looked at RANDOM, which returns a random integer between 0 and 32,767, and PWD, which contains the path to the current working directory. You saw OPTIND and OPTARG used in parsing command-line options ( 4). Sometimes, BASH_VERSION (or

You can store your own objects in view state just as easily as you store numeric and string types. However, to store an item in view state, ASP .NET must be able to convert it into a stream of bytes so that it can be added to the hidden input field in the page. This process is called serialization. If your objects aren t serializable (and by default they aren t), you ll receive an error message when you attempt to place them in view state. To make your objects serializable, you need to add the Serializable attribute before your class declaration. For example, here s an exceedingly simple Customer class: [Serializable] public class Customer { public string FirstName; public string LastName; public Customer(string firstName, string lastName) { FirstName = firstName; LastName = lastName; } } Because the Customer class is marked as serializable, it can be stored in view state: // Store a customer in view state. Customer cust = new Customer("Marsala", "Simons"); ViewState["CurrentCustomer"] = cust; Remember, when using custom objects, you ll need to cast your data when you retrieve it from view state.

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// Retrieve a customer from view state Customer cust; cust = (Customer)ViewState["CurrentCustomer"]; For your classes to be serializable, you must meet these requirements: Your class must have the Serializable attribute Any classes it derives from must have the Serializable attribute All the private variables of the class must be serializable data types Any nonserializable data type must be decorated with the NonSerialized attribute (which means it is simply ignored during the serialization process) Once you understand these principles, you ll also be able to determine what NET objects can be placed in view state You simply need to find the class information in the MSDN Help Find the class you re interested in, and examine the documentation If the class declaration is preceded with the Serializable attribute, the object can be placed in view state.

If the Serializable attribute isn t present, the object isn t serializable, and you won t be able to store it in view state However, you may still be able to use other types of state management, such as in-process session state, which is described later in the Session State section The following example rewrites the page shown earlier to use the Hashtable class The Hashtable class is a serializable dictionary collection that s provided in the SystemCollections namespace Because it s serializable, it can be stored in view state without a hitch To demonstrate this technique, the page stores all the control information for the page in the hashtable and then adds the hashtable to the view state for the page When the user clicks the Display button, the hashtable is retrieved, and all the information it contains is displayed in a label.

public partial class ViewStateObjects : SystemWebUIPage { // This will be created at the beginning of each request Hashtable textToSave = new Hashtable(); protected void cmdSave_Click(object sender, SystemEventArgs e) { // Put the text in the Hashtable SaveAllText(Table1Controls, true); // Store the entire collection in view state ViewState["ControlText"] = textToSave; } private void SaveAllText(ControlCollection controls, bool saveNested) { foreach (Control control in controls) { if (control is TextBox) { // Add the text to a collection textToSaveAdd(controlID, ((TextBox)control)Text); } if ((controlControls != null) && saveNested) { SaveAllText(controlControls, true); } } }.

protected void cmdDisplay_Click(object sender, System.EventArgs e) { if (ViewState["ControlText"] != null) { // Retrieve the hashtable. Hashtable savedText = (Hashtable)ViewState["ControlText"]; // Display all the text by looping through the hashtable. lblResults.Text = ""; foreach (DictionaryEntry item in savedText) { lblResults.Text += (string)item.Key + " = " + (string)item.Value + "<br />"; } } } } Figure 6-2 shows the result of a simple test, after entering some data, saving it, and retrieving it.

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