C#.Net 1.1 Web Service: Manipulating XML
 

Hi,
I am developing a web service in C#.Net1.1 and a new bee to .NET.
I have developed a web method to retrieve the data from database and I want to sent the response in the form of XML.I want to manipulate the dataset to get the desired XML.But I dont know how to do that?
Can somebody help me in formatting the XML. Also, once I will format the XML, what return type I should use in web method to get XML file as output.
Thanks in advance.