This tutorial will show you how to implement AJAX, LINQ and XML altogether to create a web application that can both read and save XML data. C# version. This tutorial was written with Visual Studio.NET 2008, so AJAX is fully integrated. You can use 2005, but you will need to download and install the AJAX Extensions from the Microsoft website. AJAX and LINQ are probably the most-talked about Microsoft offerings at the moment, and rightly-so. Both provide us with powerful features to add to our development arsenal- AJAX allows us to create more user-friendly web applications that can almost rival our desktop equivalents; and then LINQ provides a unified way for us to communicate and interact with a wide array of data sources. This tutorial will combine the two, and throw in a bit of XML too. In this example we are going to create a web application that will use an XML file to store small amounts of data, that we will display and also add to using AJAX and LINQ. To demonstrate this, we will be storing names, cities and ages of people in the XML file. We will use a literal control to display the XML data and three textboxes to input new data. Our XML file structure will look something like this: