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Software

Extending Built-In Web Controls - ASP.NET

{outline|||Step <1> - }

Overview¶

Although you can create a server control within its own project, sometimes you just want to extend a built-in ASP.NET web control for a single website. Here's how.

Walkthrough¶

Create Extender Class¶

• Create yourself a new class in the App_Code folder of your website, naming the class whatever you like.
• Have the class inherit from whatever control you like in the System.Web.UI.WebControls namespace.
• Be sure to specify a namespace for your class — you'll need it for the web.config file.
• Add whatever methods and properties you require.
  

Configure Your Website¶

• In the Web.Config file, add the following entry. This allows you to bypass the adding of the <%@ Register %> tag at the top of each page where you want to use the server control.
  

<system.web>
  <pages>
    <controls>
      <add tagPrefix="tag" namespace="namespace" />
      ...
    </controls>
  </pages>
<system.web>

Implement your Control¶

You can reference the new control in your ASPX code as follows.

• The tag is the same as the tag you specified in the web.config file
• The className is simply the name of the class you just created above.
  

<tag:className runat="server" ... />