Add and remove User into SharePoint group Using Client Object Model

ClientContext client = new ClientContext(“http://SiteUrl”);

client.ExecuteQuery();

Web website = client.Web;

client.Load(website, w => w.AllProperties, w => w.SiteGroups, w => w.SiteUserInfoList, w => w.Webs,w => w.Title);

client.ExecuteQuery();

GroupCollection groupCollection = website.SiteGroups;

client.Load(groupCollection, groups => groups.Include(grps => grps.Users, grps => grps.Title));

client.ExecuteQuery();

User user;

foreach (Group group in groupCollection)

{

   if (group.Title.Equals(“GroupName”))

   {

      UserCreationInformation userInfo = new UserCreationInformation();

      userInfo.LoginName = “UserName”;

             

      if (“Add”)

      {

         user = group.Users.Add(userInfo);

         group.Users.AddUser(user);

       }

       else if (“Remove”)

       {

         user = group.Users.GetByLoginName(“UserName”);

         group.Users.Remove(user);

        }

        group.Update();

        website.Update();

        client.ExecuteQuery();

       

     }

  }

 using group id

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();           

        }

    }

}