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The search() method on the IndexSearcher class returns an org.apache.lucene.search.Hits object. The Hits object contains the number of search results, a way to access the Document object for each result, and the score for each hit. The Hits class is not just a simple collection class. Because a search could potentially return thousands of hits, populating a Hits object with all of the Document objects would be unwieldy, especially because only a small number of search results are likely to be presented to the user at any one time. The doc(int n) method returns a Document that contains all of the document s fields that were stored at the time the document was indexed. Any fields that were not marked as stored will not be available.

handle the HTTP-POST from the form. Other initialization, such as configuring controls, retrieving database information, and so on, is usually done at this stage so that when the page is rendered, it is provided with all the information the user needs. It s important to note that Page_Load always fires, whether this is the first time the page has loaded or it is a postback. With the latter, you might expect it not to load, because the page is already loaded, but it does. Due to the stateless nature of web applications, each postback is treated as a new request to the page, and view state is used to maintain state between calls, as discussed earlier. As a developer, you may need to discern whether you are in a postback situation or an initial load situation, and ASP .NET provides this information for you via the IsPostBack property on the Page object. Thus, Page.IsPostBack will be true upon a postback and false on the first load. If there are actions that you only want to perform on either case, you can gate them inside an if(Page.IsPostBack) clause.

Figure 11-5. Designing a web form The web form consists of many server controls such as Label, TextBox, DropDownList, RadioButtonList, Button, RequiredFieldValidator, RegularExpressionValidator, and ValidationSummary. To begin designing the web form, use the following steps: 1. Drag and drop a Label control to the first row of the table. Set its Text property to Contact Us. Set its Font property to your choice. Also, drag and drop a Horizontal Rule HTML control below the Contact Us label. 2. Drag and drop a ValidationSummary control in the second row. The ValidationSummary control is available in the Validation node of the toolbox and is used to display a consolidated list of validation errors from the current web form. 3. Drag and drop seven Label controls in rows 3 through 9. Set their Text properties to Your Name :, Your Email :, Contacting For :, Subject :, Message :, Web Site (Optional) :, and You represent :, respectively. 4. Drag and drop a TextBox control after the Your Name, Your Email, Subject, Message, and Web Site (Optional) labels, respectively. Set the TextMode property of the Message text box to MultiLine. 5. Drag and drop a DropDownList control after the Contacting For label. 6. Drag and drop a RadioButtonList after the You Represent label. 7. Drag and drop a Button control to row 10 and set its Text property to Submit.

The length() method returns the number of search results that matched the query:

An important aspect of any web application is verifying that the data the user has input is valid. This ensures that your application is secure (e.g., so that no one is able to attempt Structured Query Language [SQL] injection attacks) and the user experience is optimized; only appropriate data is sent to the server and returned from the server. ASP.NET introduces a suite of self-sufficient validation controls that can be used to ensure that the content of your page meets validation rules. These are very useful controls, relieving you from writing reams of validation code to ensure that the correct data has been input.

8 Drag and drop a Label control to row 11 and set its Text property to a blank string This label will be used to display a success message to the user 9 Select the DropDownList control Open its property window and locate the Items property Add four items in the DropDownList: Please Select, Sales Quotation, Technical Problem, and Other 10 Select the RadioButtonList control Open its property window and locate the Items property Add two items in the RadioButtonList: Individual and Company 11 Drag and drop a RequiredFieldValidator control in front of the controls that accept name, email, reason for contact, subject, and message The RequiredFieldValidator control is used to validate that the control to which it has been attached contains some value Set the ControlToValidate property of all the RequiredFieldValidator controls to the ID property of the respective text boxes or DropDownList 12.

public final int length()