title: Get relative file path in a class library project that is being referenced by a web project
body: <p>I have an ASP.Net website that references a class library. In the class library I need to read a file into memory.</p>
  
  <p>At the top level of my class library there is a folder called <code>EmailTemplateHtml</code> containing the file <code>MailTemplate.html</code> that I want to read in.</p>
  
  <p>How can I do this?</p>