c# - How to add users to groups under Sub site's in sharepoint sitecollection? -

i have 2 sub-sites in sharepoint site,samplesite1 , samplesite2 under parentsite called mainsite.

  http://xyz.sharepoint.com/sites/mainsite/  - siteurl    http://xyz.sharepoint.com/sites/mainsite/samplesite1 - subsite1's url   http://xyz.sharepoint.com/sites/mainsite/samplesite2 - subsite2's url 

each of sites have 2 groups superuser , normaluser respectively.

the credential uses siteurl of mainsite.

securestring password = new securestring(); string pwd = "pass123"; string username = "abc@xyz.com"; password = converttosecurestring(pwd); clientcontext clientcontext = new  clientcontext("http://xyz.sharepoint.com/sites/mainsite/"); clientcontext.credentials = new sharepointonlinecredentials(username, password); 

incase of adding user subsite's groups normaluser,can use same sharepoint context above siteurl access , perform operations(add/remove user) in groups present under subsites?

if yes,how can it?i have built code add or remove user sharepoint site group based on requirement.

 public void addusertodmsite(string useremail, string securitygroupname)         {      groupcollection collgroup = spcontext.web.sitegroups;      group ogroup1 = collgroup.getbyname("userlist");      group ogroup2 = collgroup.getbyname(securitygroupname);      usercollection ousercollection1 = ogroup1.users;      usercollection ousercollection2 = ogroup2.users;      spcontext.load(ousercollection1);      spcontext.load(ousercollection2);      spcontext.executequery();      var uname = ogroup1.users.getbyemail(useremail);      var usercheck = ousercollection2.where(u => u.email == useremail).firstordefault();      if (usercheck == null)      {           microsoft.sharepoint.client.user ouser2 = ogroup2.users.adduser(uname);      }      spcontext.executequery();       } 

for subsites can proceed follows:

web owebsite = clientcontext.web; clientcontext.load(owebsite, website => website.webs); clientcontext.executequery(); foreach (web orwebsite in owebsite.webs) {     addusertodmsite(useremail, securitygroupname, orwebsite) } 

and change addusertodmsite work either sites , subsites as:

public void addusertodmsite(string useremail, string securitygroupname, web aweb)     {  groupcollection collgroup = aweb.sitegroups;  group ogroup1 = collgroup.getbyname("userlist");  group ogroup2 = collgroup.getbyname(securitygroupname);  usercollection ousercollection1 = ogroup1.users;  usercollection ousercollection2 = ogroup2.users;  spcontext.load(ousercollection1);  spcontext.load(ousercollection2);  spcontext.executequery();  var uname = ogroup1.users.getbyemail(useremail);  var usercheck = ousercollection2.where(u => u.email == useremail).firstordefault();  if (usercheck == null)  {       microsoft.sharepoint.client.user ouser2 = ogroup2.users.adduser(uname);  }  spcontext.executequery();   }