how to generate barcode in vb.net 2010 Control Class in .NET

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Control Class
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WebControl Class Control
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HtmlControl Abstract Class Control
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TemplateControl Abstract Class Control
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OtherSpecializedControls Abstract Class Control
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Page Class Template Control
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Figure 2-1 The Control class with its primary child classes. Note that OtherSpecializedControls is not a class; it s simply an indicator that there are other specialized controls that inherit from the Control class.
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This section covers the life cycle of the Web page and its controls. After that, HTML and Web server controls are covered.
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After this lesson, you will be able to:
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Describe the life cycle of the Web page and its controls. Describe ViewState. Explain the order and purpose of the primary events that take place when a page is requested.
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Estimated lesson time: 30 minutes
2
Adding and Configuring Server Controls
Understanding the Life Cycle of the Web Page and Its Controls
To thoroughly understand how server controls operate, it s important to have a good understanding of the life cycle of a Web page and its controls. The life cycle starts when the browser requests a Web page from a Web site. The Web server constructs the Web page object and all of its child control objects and uses these objects to ren der the Web page to the browser. After that, the objects are destroyed. The Web page object and its child control objects are destroyed to free up resources. This allows the Web server to scale nicely but poses problems when you re trying to hold onto object data, or state, between calls to the server. This is where ViewState comes to the rescue.
What Is ViewState
ViewState is the mechanism by which Web page object and child control object data can be maintained between page requests. Any object data that cannot be represented as HTML in the Web page is eligible to be placed into ViewState. For example, when a user clicks the Submit button on a Web page, a Postback occurs, sending all form data back to the Web server. ViewState is implemented by using a hidden form field called __ViewState to store the data. At the server, ViewState is used to reconstruct the Web page and its server controls.
Using EnableViewState to Minimize ViewState Size
Adding lots of data to ViewState can cause performance problems because the data is sent to the browser when a page is requested and back to the server when the data is posted back. To minimize the data that is in ViewState, you can set the EnableViewState property, which your server controls to false. Be careful, however, because setting this property to false means that you need to write code to repopulate the control yourself between page calls.
Control and Data State Separation
In ASP.NET 2.0, controls have the ability to separate data state and control state. Pre vious versions of ASP.NET stored data and control state together, and when a con trol s EnableViewState property was set to false, the control lost its appearance along with the data. What this means is that, in ASP.NET 2.0 you can set a control s EnableViewState to false and you lose the data but not the control s appearance. This also means that a control may still be contributing to the size of the __ViewState input even when the EnableViewState property is set to false.
Lesson 1: Using a Server Control
NOTE
.NET 2.0
Control state and data state separation is new in ASP.NET version 2.0.
Identifying ViewState Contributors
One problem that plagues many Web pages is that ViewState becomes bloated, which causes performance problems when receiving and posting pages. You can use the ASP.NET trace facility to examine the controls that contribute to ViewState. The trace facility also displays the ViewState size for each control, which means that you can eas ily identify the source of the bloat. To use the ASP.NET trace facility to identify ViewState contributors, follow these steps: 1. Enable the trace facility as described in 1, Introducing the ASP.NET 2.0 Web Site. 2. Browse the Web site, visiting the Web pages that you are interested in obtaining ViewState information for. 3. View the trace information; the Control Tree section indicates the ViewState size and the ControlState size for each control on the Web page.
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