条件比较distinct 查询

有下面的语句，
select distiinct name，pass, userid from users where name like '%z' order by userid desc;

怎么用LINQ来实现这种查询的效果？

[csharp] view plaincopy

1. public class UserComparer : IEqualityComparer<User>    
2.     {    
3.         public bool Equals(User u1, User u2)    
4.         {    
5.             return u1.Name==u2.Name;    
6.         }    
7.         public int GetHashCode(User u)    
8.         {    
9.             return u.ToString().GetHashCode();    
10.         }    
11.     }    
12. var query=db.Users.Where(u=>u.Name.EndWith("z"))  
13.           .OrderByDescending(u=>u.userid)  
14.           .Disctinct(new UserComparer());