xml changing the value of an attribute

Question

I have the following text in xml file:

Answer 1

var doc = XDocument.Load("test.xml");
doc.Root.Element("XCAM").Attribute("LibraryDirectory").Value = "new value";
doc.Save("test.xml");

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UPDATE:

doc.Root
   .Element("InputFormats")
   .Element("XCAM")
   .Attribute("LibraryDirectory").Value = "new value";

or using XPATH:

doc.XPathSelectElement("//InputFormats/XCAM")
   .Attribute("LibraryDirectory").Value = "new value";

Don't forget to add the using System.Xml.XPath as XPathSelectElement is an extension method.