New Post: what is the best way to deploy task scheduler with my .exe ?

when i am running above code in installer class its giving error (18,8)UserId:
if i am going to provide UserId: in
ts.RootFolder.RegisterTaskDefinition("Test", td,TaskCreation.CreateOrUpdate,string.Concat(Environment.UserDomainName, "\", Environment.UserName),null,TaskLogonType.S4U,null);

again error
(20,8)UserId:

Thanks