Adding Local User to Local Admin Group

Question

I am writing a C# program to be pushed out the labs I work in. The program is to create a local admin account(itadmin), set the password, set the password to never expire,

Answer 1

For Update 3 (for Multi Language support)

Please use build in identifiers --> "Well Known SIDs" for build in accounts or groups:

var sAdministrators = new SecurityIdentifier(WellKnownSidType.BuiltinAdministratorsSid , null).Translate(typeof(NTAccount)).Value;

groupPrincipal = GroupPrincipal.FindByIdentity(systemContext, IdentityType.Name, sAdministrators.ToString());

and not: ..... FindByIdentity(systemContext, "Administrators");

Because if you want to use it "world wide" and outside of the engl. world you will get an error. Example: Germany use "VORDEFINIERT\Administratoren" as Name.