Add users to SP Group Programatically for a Claims Based Web Application

Here's the code to Add users to SharePoint Group Programatically for a Claims Based Web Application

Note that we need to add claims token to the user name before adding them to the group since its a claims based web application.

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using AddUsers.UserGroup;
using Microsoft.SharePoint;
using Microsoft.SharePoint.Administration.Claims;

namespace AddUsers
{
    class Program
    {
        static void Main(string[] args)
        {
            using (UserGroup.UserGroup userService = new UserGroup.UserGroup())
            {
                String uriVal = "http://site/sites/testsite/_vti_bin/UserGroup.asmx";
                String userName = String.Empty;
                userService.Url = uriVal;
                userService.Credentials = new System.Net.NetworkCredential("username", "password", "domain");
                SPClaimProviderManager ClaimManager = SPClaimProviderManager.Local;
                if (ClaimManager != null)
                {
                    try
                    {
                        SPClaim claim = new SPClaim(SPClaimTypes.UserLogonName, "username", "http://www.w3.org/2001/XMLSchema#string", SPOriginalIssuers.Format(SPOriginalIssuerType.Windows));
                        userName = ClaimManager.EncodeClaim(claim);
                    }
                    catch (Exception ex)
                    {
                    }
                }
                userService.AddUserToGroup("Approvers", userName, userName, "useremail", "");

            }
        }
    }
}