generate barcode image vb.net PART III in Visual C#.NET

Printer UPC Symbol in Visual C#.NET PART III

PART III
Universal Product Code Version A Generation In C#.NET
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UPCA Decoder In C#
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Table 12-1
Generating Barcode In C#
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Recognizing Barcode In C#
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Some of the HTML Controls in the Visual Studio NET Toolbox (continued)
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Printing UPCA In .NET Framework
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To add any control from the Toolbox to a Web Form, you can use either of two techniques: Double-click the control to get a default-sized control on the form Select the control and draw the control on the form
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Bar Code Creation In Visual C#.NET
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Adding HTML Controls
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Let s continue working with the WebApplication1 form you created in a previous section add two text fields and a button as shown in Figure 12-4 The HTML definition of the controls can be viewed in the HTML editor for the Web Form, as shown in Figure 12-5
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MCAD/MCSD Visual C# NET Certification All-in-One Exam Guide
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Figure 12-4
UPCA Encoder In None
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UPC Code Recognizer In Visual Studio .NET
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Web Form with HTML controls
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Figure 12-5
Barcode Creator In None
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The HTML code for the controls
12: Web Forms: Client-Side Programs
The code added to the form looks like this:
<INPUT style="Z-INDEX: 101; LEFT: 8px; POSITION: absolute; TOP: 8px" type="text">
Where the attributes are set for absolute positioning, the control will have position values based on the top left corner of the Web Form After the control has been added to the form it does not, however, have any name properties set, so we need to attend to that The properties are set through the Properties Explorer in the IDE, shown in Figure 12-6 The HTML controls allow you to develop traditional client-side dynamic HTML applications The power of ASPNET, however, lies in how you can use server-side controls for better cross-platform availability, and, in many cases, better performance The next section will delve into the server-side controls PART III
Figure 12-6 The Properties Explorer
MCAD/MCSD Visual C# NET Certification All-in-One Exam Guide
Web Server Controls
ASPNET server controls are rendered using standard HTML in the client s browser, making the controls functional in almost any browser version Server controls are very close to HTML controls, but you program them using C# and the object model you have become used to through your C# experience The server controls are found in the Toolbox under the Web Forms section, as shown in Figure 12-7 NOTE You must be in Design view in order to see the Web Forms section of the Toolbox
Some of the web server controls are encapsulated standard HTML controls, while others are totally new Table 12-2 lists some of the server controls To declare a server control, you use an XML-style element to define the control, and that element must follow the XML rules, even though it s not technically XML It is a good rule to always follow the XML rules
Description
Label
TextBox
Button HyperLink DropDownList ListBox CheckBox
CheckBoxList RadioButton RadioButtonList Image Panel PlaceHolder Table 12-2
Displays textual information The user cannot edit the text Use the Text property to change the content of the Label control Creates a single-line text box for the input and display of text It is commonly used to allow the user to enter and edit information Creates a clickable control for user interaction Encapsulates a hyperlink Displays one field with the selected value and a list of alternative values when the selection button is clicked Display a window with many choices The client can select from one or more options Represents a True/False Boolean value The check box has three visual states: empty, checked, and grayed (indicating an invalid condition) Creates a collection of check boxes that are treated as one item The control functions similarly to other list controls Allows the user to select between mutually exclusive values Creates a collection of RadioButton controls that are treated as one object Puts pictures on the page This control accepts a number of image file formats, with gif and jpg being the most common Creates a container for other controls Allows dynamic control creation at run time
Some of the Web Server Controls
12: Web Forms: Client-Side Programs
Figure 12-7 The web server controls
PART III
MCAD/MCSD Visual C# NET Certification All-in-One Exam Guide
The web server control definition is entered into the <Form> section of the aspx file, it uses this general format:
<asp:SC runat="server" attributes="value">Content</asp:SC>
EXAM TIP Learn the basic form for the ASPNET server control element, especially that runat="server" must be included
The SC is the name of the server control, and the attribute to the element is one or more of the attributes specified for the control, such as the name attribute Note the XML end tag that must be included Note also that the web server control definition is case sensitive The runat="server" attribute is mandatory; if it is forgotten, the control will not display EXAM TIP Remember the six rules of XML we looked at in 8 There must be one and only one root element, XML is case sensitive, elements must be properly nested, elements must have opening and closing tags, attributes cannot be repeated, and attribute values must be enclosed in quotes
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