You want to create a custom control
that remembers its state between
postbacks of a form, like the server controls
provided with ASP.NET.
Create a custom control like the one described in Recipe 5.2, implement the
IPostBackDataHandler interface to add
the functionality to retrieve the
values posted to the server, and then update the values in the custom
control from the
Use the .NET language of your choice to:
Create a class that inherits from the
class in the
Implement support for HTML-style attributes by adding properties to the class.
IPostBackDataHandler as necessary to
update the state of the control with the posted data.
Render method to have it render the
HTML output of the control using the values of the properties.
To use the custom control in an ASP.NET page:
Register the assembly containing the control.
Insert the tag for the custom control anywhere in the page and set the attributes appropriately.
A version of the custom control that maintains state and provides the
added ability to raise an event when the control data has changed is
shown in Example 5-10 (VB) and Example 5-11 (C#). Example 5-12
through Example 5-14 show the
.aspx and code-behind files of an application that uses ...