Rewrote Hello World tutorial.

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-<com:TContent ID="body" >

-<h1>Sample: Hello World</h1>

-<p>

-"Hello World" perhaps is the simplest <i>interactive</i> PRADO application that you can build. It displays to end-users a page with a submit button whose caption is <i>Click Me</i>. When the user clicks on the button, the button changes the caption to <i>Hello World</i>.

-</p>

-<p>

-There are many approaches that can achieve the above goal. One can submit the page to the server, examine the POST variable, and generate a new page with the button caption updated. Or one can simply use JavaScript to update the button caption upon its <i>onclick</i> event.

-</p>

-<p>

-PRADO promotes component-based and event-driven Web programming. The button is represented by a <i>TButton</i> object. It encapsulates the button caption as the <i>Text</i> property and associates the user button click action with a server-side <i>Click</i> event. Therefore, the "Hello World" task can be handled intuitively and easily. One simply needs to attach a function to the button's <i>Click</i> event. Within the function, the button's <i>Text</i> property is modified as "Hello World". The following diagram shows the above sequence,

-</p>

-<img src="<%~Samples/HelloWorld/sequence.gif%>" />

-<p>

-The code that a developer needs to write is merely the following event handler function, where <tt>$sender</tt> refers to the button object.

-<com:TTextHighlighter CssClass="source">

-public function buttonClicked($sender,$param)

-{

-	$sender->Text = "Hello World";

-}

-</com:TTextHighlighter>

-</p>

-<p>

-The following line in the page template attaches the <tt>buttonClicked()</tt> method to the <tt>OnClick</tt> event of the button,

-</p>

-<com:TTextHighlighter Language="prado" CssClass="source">

-&lt;com:TButton Text="Click Me" OnClick="buttonClicked" /&gt;

-</com:TTextHighlighter>

-

-<com:RunBar PagePath="Fundamentals.Samples.HelloWorld.Home" />

-

-</com:TContent>
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