Remove the user from the group in SharePoint 2010 using Client Object Model

 

using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

using Microsoft.SharePoint.Client;

 

namespace COM

{

    class Program

    {

        static void Main(string[] args)

        {

            // siteURL is the string that contains the site URL

            string siteUrl = "http://serverName:50000/sites/Testing";

            // ClientContext object is used to get the context for the SharePoint objects

            ClientContext clientContext = new ClientContext(siteUrl);

            Web web = clientContext.Web;

            User user = web.EnsureUser(@"domainName\userName");

            Group testingOwnersGroup = web.SiteGroups.GetById(6);

            UserCollection userCollection = testingOwnersGroup.Users;

            userCollection.Remove(user);                      

            clientContext.ExecuteQuery();          

        }

    }

}