shows in .NET framework

Draw UPC-A Supplement 2 in .NET framework shows

It helps to add text and background colors to identify the layout s regions until the page takes shape with real content The following code shows the final markup created by the preceding procedure with added placeholder text and shades of gray:

<table border= 0 cellpadding= 0 cellspacing= 0 style= width: 100%; height: 100% > <tr> <td valign= top colspan= 2 style= height: 10px; background-color: lightgrey; >   Banner Area</td> </tr> <tr> <td style= width: 100px; background-color: dimgray; valign= top >Left Hand Column </td> <td style= background-color: gainsboro valign= top >         Main Content Area </td> </tr> </table>

Forming HTML forms Creating text boxes Punching radio buttons Buttoning down lists Processing form submissions with ASPNET Keeping your tabs in order

form is an HTML element that contains input controls through which a user can enter data that he or she wants to submit to the Web server Using forms is the essence of ASPNET Web programming, as all ASPNET Web pages ultimately are rendered as HTML forms that are sent to the browser In this chapter, you can discover the ins and outs of forms Even if you never code an HTML form on your own, understanding what HTML forms can and can t do may give you a better understanding of how ASPNET server controls work

In HTML, the <form> and </form> tags mark a specialized area of the document in which users can select items and type in data The form collects user input and submits it somewhere, usually to a Web server for further processing The HTML form can hold several types of input controls, including text fields, drop-down lists, buttons, check boxes, and radio buttons We look at each of these controls in detail in this chapter For starters, here s the HTML markup for a typical form that lets the user make some choices:

<form action= http://wwwkencoxca/usubmittedaspx method= post > Please tell us why you get up in the middle of the night:<br /><br /> <input id= Radio1 name= Radio1 type= radio value= water /> To get a glass of water<br />

<input id= Radio2 name= Radio2 type= radio value= bathroom /> To go to the bathroom<br /> <input id= Radio3 name= Radio3 type= radio value= home /> To go home<br /> <input id= Radio4 name= Radio4 type= radio value= other /> Other <input name= Text1 id= Text1 type= text /><br /> <br />   <input id= submit value= Send type= submit />  <input id= reset type= reset /> </form>

Figure 3-1 shows the preceding code as rendered in Visual Web Developer s Design view In this typical use for an HTML form, visitors make a selection, type some text, and click Send to send the data on its way

HTML forms are very easy going because they allow almost any kind of HTML markup within their boundaries In some Web pages, the <form> tag contains the page s entire visual markup, including text, tables, styles, and images

The tags <form> and </form> mark an HTML form Forms get short shrift in Visual Web Developer and are completely taken for granted; you can t drag a form from the Toolbox and drop it on the design surface When you add a new HTML page to your project, VWD doesn t ask, Do you want a form with that it just assumes that you don t and leaves it out In fact, you can put a <form> element into a regular HTML file only by typing it yourself, pasting it in, or dragging your own snippet from the Toolbox Yes, ASPNET pages do include the <form> element because server-side pages can t interact without a server-side form