using CMS.SiteProvider;

// Get role of specified name from current site

RoleInfo role = CMS.SiteProvider.RoleInfoProvider.GetRoleInfo("ArticleEditor", CMS.CMSHelper.CMSContext.CurrentSiteName);

if (role != null)

{

  // Get datatable of the role members

  DataTable users = CMS.SiteProvider.RoleInfoProvider.GetRoleUsers(role.RoleID);

  if (users != null)

  {

     // the table now contains the users that belong to the given role ...

  }

}

using CMS.SiteProvider;

// Get UserInfo of the specified name

UserInfo user = CMS.SiteProvider.UserInfoProvider.GetUserInfo("Alice");

if (user != null)

{

  // Get table with all user roles

  DataTable table = CMS.SiteProvider.UserInfoProvider.GetUserRoles(user.UserID);

  if (table != null)

  {

     // the table now contains the roles the user is member of...

  }

}

// Use UserName, RoleName and SiteName to add user to role

CMS.SiteProvider.UserInfoProvider.AddUserToRole("Alice", "DocumentEditor", CMS.CMSHelper.CMSContext.CurrentSiteName);

// Use UserName, RoleName and SiteName to remove user from role

CMS.SiteProvider.UserInfoProvider.RemoveUserFromRole("Alice", "DocumentEditor", CMS.CMSHelper.CMSContext.CurrentSiteName);