How to update record using LINQ programmtically?

DataUsersClassesDataContext dataUsers = new DataUsersClassesDataContext(); // LINQ object
// Users is the database table inside the LINQ object, AutoID is the primary key that is used to compare the value
ThisUser user = dataUsers.Users.Single(u => u.AutoID == XXXX); 
if (user != null)
{
     // set properties
     user.Active = active; 
     user.Name = "MyName";
     user.Role = role;
     user.ThisDateTime = DateTime.Parse(thisDateTime);
     dataUsers.SubmitChanges(); // submit the changes that will update the database.
}