.NET XMLDoccument handling in C#

Given the below C# code using VS2005:
       XmlDocument xn = new XmlDocument();

Please advise the remaini ng code to accomplish the following:
1) Fill xn with an XML file and make it a useable XML document ready to be sent to a WS
2) Do the same as (1) with a string storing the same XML data.

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To load from a file:

To load from a string containg XML:
xn.LoadXml( myXMLstring );

ksfokAuthor Commented:
How would I handle "xn.Load(myFilePath);" if an XML file is placed under app_data folder?
If this is a web app,

string path = HttpContext.Current.Server.MapPath(HttpContext.Current.Request.ApplicationPath + "\\app_data\\MyFile.xml");

If it's a windows app, you can just use the complete path to that directory, or if it's under the directory where your application resides, just:

string path = "app_data\\MyFile.xml";


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