Not able to read xml from different project.

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C#

I have two project in one solution.
1st project is WCF
2nd project is Class Library
All the Logic of Service is in Class Library.

I wan to read xml file which is include in WCF project from Class Library project.

My code in class library is

XmlDocument XmlDocParent = new XmlDocument();

XmlDocParent.Load("Test.xml");

I also try with below approach
XmlDocParent.Load("~/Test.xml");
XmlDocParent.Load("../Test.xml");


But its giving me error as
File Not found exception.
Could not find file 'C:\Program Files (x86)\IIS Express\Test.xml'.