Exception mapping file using NHIBERNATE

I am trying to create a sample NHibernate application. And I am getting an exception {"Could not find a getter for property 'Id' in class 'NHibernateTest.Users'"} . The Id is the primary key for the table.

I have tried to set the Id as

 public int ID
        {
            get { return this.Id;}
        }
based on some help from the internet.
But still this doesnt help. I have attached all the files.

Hope someone can help me out.

Please rename all the files without the .txt extension.





AssemblyInfo.cs.txt
Program.cs.txt
Users.cs.txt
Users.hbm.xml.txt