Hello, world!

In almost every programming tutorial you will find the classic "Hello, world!" example, and who am I to break such a fine tradition? Let me show you how you can say hello to the world from ASP.NET. Open the Default.aspx (if it's not already opened) by doubleclicking it in the Solution Explorer. It already contains a bunch of HTML markup, as well as some stuff you probably won't recognize, like the Page directive in the top, or the runat attribute on the form tag. This will all be explained later, but for now, we want to see some working code.

First of all, we will add a Label control to the page. A Label control is some what simple, since it's just used to hold a piece of text. Add the following piece of HTML-looking code somewhere between the set of <form> tags:
<asp:Label runat="server" id="HelloWorldLabel"></asp:Label>
Secondly, add this script block somewhere on the page, preferably below the Page directive in the top:
<%
    HelloWorldLabel.Text = "Hello, world!";
%>
If you haven't worked with ASP.NET before, I'm sure there's a bunch of things that you're wondering about now, but as I said, this is all about seeing some results right now. To see the page in action, use Debug -> Start Without Debugging, or simply press F6. Visual Studio will now compile your project, and launch the page you're working on in your default browser. The page will simply have a piece of text which says "Hello, world!" - congratulations, you have just created your first ASP.NET website! Here is the complete listing:
<%
    HelloWorldLabel.Text = "Hello, world!";
%>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
    <title>Untitled Page</title>
</head>
<body>
    <form id="form1" runat="server">
    <div>
        <asp:Label runat="server" id="HelloWorldLabel"></asp:Label>
    </div>
    </form>
</body>
</html>
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