join using lambda expression and Linq

Hi,

Please refer below code

C#

List<User> users = new List<User> { 
                        new User{
                            UserId = 1,
                            UserName = "David"
                        },
                            new User{
                            UserId = 2,
                            UserName = "Kevin"
                        }
};

List<Membership> memberships = new List<Membership> { 
                        new Membership{
                            UserId = 1,
                            IsApproved = true
                        },
                            new Membership{
                            UserId = 2,
                            IsApproved = false
                        }
};

//Join Using Lambda Expression
var result = users.Join(memberships, x => x.UserId, y => y.UserId, (user, member) => new { UserName = user.UserName, IsApproved = member.IsApproved });

// Join using Linq
var resultLinq = from user in users
                    join member in memberships
                    on user.UserId equals member.UserId
                    select new { UserName = user.UserName, IsApproved = member.IsApproved };

Classes

public class User
{
    public int UserId { get; set; }
    public string UserName { get; set; }
}

public class Membership
{
    public int UserId { get; set; }
    public bool IsApproved { get; set; }
}

I hope this will help you out.