public void SacuvajAsisUBazu()
        {

            using (SqlConnection conn = new SqlConnection(Data.CONNECTION_STRING))
            {
                conn.Open();
                SqlCommand command = conn.CreateCommand();
                command.CommandText = @"insert into Asistent(Ime, KorisnickoIme, Prezime, TipZaposlenog,Lozinka,Email,Profesor, Active) values
            (@Ime, @KorisnickoIme,@Prezime, @TipZaposlenog, @Lozinka, @Email, @Profesor, @Active)";
                command.Parameters.Add(new SqlParameter("Ime", this.Ime));
                command.Parameters.Add(new SqlParameter("KorisnickoIme", this.KorisnickoIme));
                command.Parameters.Add(new SqlParameter("Prezime", this.Prezime));
                command.Parameters.Add(new SqlParameter("TipZaposlenog", this.TipZaposlenog));
                command.Parameters.Add(new SqlParameter("Lozinka", this.Lozinka));
                command.Parameters.Add(new SqlParameter("Email", this.Email));
                command.Parameters.Add(new SqlParameter("Profesor", this.Prof.KorisnickoIme));

                command.Parameters.Add(new SqlParameter("Active", this.Active));

                command.ExecuteScalar();

            }

        }

        public void UpdateAsis()
        {
            using (SqlConnection conn = new SqlConnection(Data.CONNECTION_STRING))
            {
                conn.Open();

                SqlCommand command = conn.CreateCommand();
                command.CommandText = @"update Asistent set Ime =@Ime, Prezime =@Prezime,Lozinka =@Lozinka, Email =@Email, Profesor =@Profesor, Active =@Active
                where KorisnickoIme = @KorisnickoIme";
                command.Parameters.Add(new SqlParameter("Ime", this.Ime));
                command.Parameters.Add(new SqlParameter("Prezime", this.Prezime));
                command.Parameters.Add(new SqlParameter("Lozinka", this.Lozinka));

                command.Parameters.Add(new SqlParameter("Email", this.Email));
                command.Parameters.Add(new SqlParameter("Active", this.Active));
                command.Parameters.Add(new SqlParameter("Profesor", this.Prof.KorisnickoIme));

                command.Parameters.Add(new SqlParameter("KorisnickoIme", this.KorisnickoIme));

                command.ExecuteNonQuery();


            }
        }