将XPath与ASP.NET C＃Web应用程序一起使用

I'm new in using Xpath with ASP.NET C#. I have a Gridview and am able to Insert/Edit/Delete data from an xml file. However I need to be able to perform the same task using a more complicated xml file. Could someone help me get started as to how I would go about implementing the Xpath Functionality into my code?I'm new in using Xpath with ASP.NET C#. I have