Because we're not using the WebForms model, let's quickly remove the tags for the element. You should be getting used to page declarations (the bit in .aspx pages) by now, so the declaration will come as no surprise.
The Literal control is very useful when you want to render something to the page without any extra markup. But if you don't want the span tags at all, for example for the page , you need the Literal control. This is really just scratching the surface, as it's possible to have multiple master pages (even nested master pages!). As you're familiar with OOP you can see how this can be used to build large-scale web applications.
To access your connection string you can use the ConfigurationManager class which we used in part 1 of the tutorial to access global configuration settings. The object you set up in the brackets is automatically destroyed when your code leaves the end curly brace "}". But there's a much better way to display simple loops, and that's using the Repeater control.
As a Repeater will throw an Exception if an empty DataSet is bound to it, you need to check there is data to be bound first. I think you'll agree that having a control which sets templating for repeating data as easily as that is a massive help to the developer. Let's pull the last couple of sections together and create a data access class that will simplify connecting to and running commands on your database. You may notice the new file has an extension of .ascx, this is the extension for user controls.
Here you can see instead of a Page declaration we have a Control declaration, but the same Inherits property to bind it to the code-behind file.
Here you can see that the public string property I declared in my ShortCode user control class (public string Link;) can be set in a Link property of the control. However it's possible to register your tag prefixes in your web.config file, so you don't have to do it on every page (as explained by Scott Guthrie - that's one blog you'll want to follow). This means that C# is faster (yes, it's true, sorry), and that you can catch a lot of errors in your code *before* you try to run it.


There are several other articles which do a much better job at explaining this than I would so I'll just link to them. Follow us on Twitter, or subscribe to the Nettuts+ RSS Feed for the best web development tutorials on the web. Diving into the twitter api Save $30 with a yearly subscription to premium New courses on tuts+ premium!
Perhaps they were Windows desktop application developers making the jump to the web, maybe they had never hand-coded HTML.
For example, the evil javascript:__doPostBack function is a perfect way to make your website impossible to use for a large proportion of the web audience - oh, and search engines as well. A master page is a template file you can use to encapsulate HTML you use in multiple pages.
Let's have a go at building something that looks more like a real web application, starting with the master page. Firstly I haven't used the PageJS content placeholder at all - it's quite OK to leave it out entirely (of course nothing will be rendered to the page for that area). You can also set the master page programatically (but this needs to be done in the Page_Init event, as Page_Load is too late in the page lifecycle). Let's create a security class by right-clicking the root of your application and selecting "Add > New file" then choosing "Empty class" from the "General" section and calling it "Security". I've also added the "static" keyword to the property and method, and I've made the CheckSession() method public.
As you're fully aware of the advantages that OOP can give you for abstraction, encapsulation and inheritance you'll see how powerful this is. You can do this in web.config, add this code inside the "configuration" section (the MySQL and SQL Server code should be pretty obvious).
In the code above the results from the database query are fed into a DataSet, which is an object containing one or more tables, each table containing rows and columns. One thing to note with the Repeater control - if you bind a DataSet to it by default the first table is used. As the code says, the ExecuteNonQuery method executes a query and returns the number of affected rows.
It would be easy for you to extend this data access class to have more useful properties and methods for your applications.


Firstly add a new file of type "User control with code-behind file" and call it "ShortLink". We also have a standard element with the runat="server" property to make it a server-side control.
And the best thing about user controls is, because they are just like pages (without , and tags) you can put anything you like in them. Rather than PHP, which is compiled into language the computer can understand at runtime, C# is pre-compiled (or sometimes compiled on first run) and saved in assemblies for the computer to process. It's also worth stressing that you need a good grasp of object oriented programming (OOP) to continue. For example, your master page could contain the header, menu and footer of your pages, while your normal .aspx pages contain the actual content on that page. In that directory create a new master page by right-clicking on the Master_Pages folder, selecting "Add > New file" then selecting "Master Page with Code Behind" and call it "DefaultMaster".
But if we're going to use objects, we really need some serious data to model in our objects.
The Repeater control allows you to "bind" data, for example from a DataSet, and display it in a looped manner.
If you're using stored procedures instead of inline SQL to run commands against your database you can return multiple tables, meaning you can load several sets of data for use in a page at once. In fact it would be possible to write an entire application in user controls, including the relevent controls in your page depending on some parameters passed to it.
However I've found many good things in the framework, and have come to appreciate the power of the C# language - without losing my love for PHP. It also means you can't do live hacking of your code-behind files in a running application. The fix (for me) was to manually add the reference by right-clicking the References folder in my application and going to "Edit references".
Using this simple control gives you an easy way to display repeating data, with complete control over the resulting HTML - just like you would do in PHP.




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