how to add users to Subsite groups in sharepoint siteCollection?

See more:

C#

ASP.NET

SharePoint2013

, +

I have two sub-sites in my sharepoint site,SampleSite1 and SampleSite2.
Each of the Sites have two groups superUser and NormalUser. I have given my sharepoint context credentials in appsettings of config file along with SiteUrl

http://LeslieJames.sharepoint.com/sites/MainSite/

//DummyUrl

Incase of adding user to subsite's groups like NormalUser,Can we use the same sharepoint context with above siteUrl to access and perform operations in groups present under subsites?

If Yes, can u share the logic.I already have built code to add or remove user from a sharepoint site group based on some requirements.

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();