Notice that the example actually inherits from windows form control

Listing 15.1 shows the code you’ll use to create the example in this section. Notice that the example actually inherits from a Windows form control, rather than a Web control. You’ll find this example in the \Chapter 15\SampleControl folder of the source code on the Sybex Web site.

public String ResourceURL
{
get
{
// Return the string that the user provided as input or // nothing when the URL is invalid.

if (_ResourceURL == null)
return "";
else
return _ResourceURL.AbsoluteUri;
}
set
{
// Use a try...catch block in case the user passes // something other than a valid URI.

if (_ResourceURL == null)
return "0";
else
return _ResourceURL.Port.ToString(); }
}

public Boolean IsValidURL
{
get
{
// Verify that the resource URL is valid. The _ResourceURL // variable is null when the URL is invalid.

String TheData; // Contains the actual data.

// If the URL isn't valid, then return.
if (_ResourceURL == null)
return "";

this.Text = "Getting the Response";
Response = (HttpWebResponse)Request.GetResponse();