Handling Postback Data
If your control needs to process form data submitted to the server, you need to implement the IPostbackDataHandler interface. This interface includes the following two methods:
• LoadPostData()—
Receives the form fields posted from the browser.
• RaisePostDataChangedEvent()—
Enables you to raise an event indicating that the value of a form field has been changed.
For example, the control in Listing 36.16 is a simple TextBox control that implements the IPostbackDataHandler interface to preserve the state of an input field across postbacks.
Listing 36.16. CustomTextBox.cs
The LoadPostData() receives the form fields posted ...
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