title: The type or namespace name 'ClaimsAuthenticationManager' could not be found
body: <p>I am trying to use the ClaimsAuthenticationManager class but I cannot figure out how to add the proper namespace to my project.</p>
  
  <p>When I try to use the class in my project I get the error, "The type or namespace name 'ClaimsAuthenticationManager' could not be found. Typically this is resolved by installing the correct nuget package and using the namespace. However this seems to be a special case. </p>
  
  <p>This SO question <a href="https://stackoverflow.com/questions/17409501/a-member-of-the-system-security-claims-namespace-is-not-available">A member of the System.Security.Claims namespace is not available?</a> is very similar. The resolution was to add a reference to System.IdentityModel.dll.</p>
  
  <p>I added a reference to System.IdentityModel.dll by right clicking on the project and selecting Add>Reference. I pointed it to System.IdentityModel.dll on disk at the location: C:\Program Files\Reference Assemblies\Microsoft\Windows Identity Foundation\v3.5\System.IdentityModel.dll.</p>
  
  <p>I've also added the using statement: "using System.Security.Claims;"</p>
  
  <p>I tried cleaning and rebuilding the project. Still having the same issue.</p>