Add Users to Group in SharePoint 2013 using CSOM

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using Microsoft.SharePoint.Client;
namespace GowthamSamples
{
    class Program
    {
        static void Main(string[] args)
      {
            // ClientContext - Get the context for the SharePoint Site
            ClientContext clientContext = new ClientContext("http://gauti.sharepoint.com/sites/sp1/");
            GroupCollection Groups = context.Web.SiteGroups;
            // Assume that there is a "Owners" group, and the ID=7.
            Group ownersGroup = Groups.GetById(7);
            // Let's set up the new user info.
            UserCreationInformation userCreationInfo = new UserCreationInformation();
            userCreationInfo.Email = "[email protected]";
            userCreationInfo.LoginName = "sharepointdev\\gowtham";
            userCreationInfo.Title = "User";
            // Let's add the user to the group.
            User newUser = ownersGroup.Users.Add(userCreationInfo);
            context.ExecuteQuery();
        }
    }
}