How to save this string into XML file?

I have this string variable:

string xml = @"<Contacts> 
    <Contact> 
    <Name>Patrick Hines</Name> 
    <Phone Type=""Home"">206-555-0144</Phone> 
    <Phone Type=""Work"">425-555-0145</Phone> 
    <Phone Type=""Mobile"">332-899-5678</Phone> 
    <Address> 
        <Street1>123 Main St</Street1> 
        <City>Mercer Island</City> 
        <State>WA</State> 
        <Postal>68042</Postal> 
    </Address> 
    </Contact> 
    <Contact> 
    <Name>Dorothy Lee</Name> 
    <Phone Type=""Home"">910-555-1212</Phone> 
    <Phone Type=""Work"">336-555-0123</Phone> 
    <Phone Type=""Mobile"">336-555-0005</Phone> 
    <Address> 
        <Street1>16 Friar Duck Ln</Street1> 
        <City>Greensboro</City> 
        <State>NC</State> 
        <Postal>27410</Postal> 
    </Address> 
    </Contact>
</Contacts>";

How can I save this string into an XML file in my drive c? Using c#.

Answer:

The fact that it's XML is basically irrelevant. You can save any text to a file very simply with File.WriteAllText:
File.WriteAllText("foo.xml", xml);

Note that you can also specify the encoding, which defaults to UTF-8. So for example, if you want to write a file in plain ASCII:
File.WriteAllText("foo.xml", xml, Encoding.ASCII);