private void btnSave_Click(object sender, EventArgs e)
        {
            User korisnik = new User();

            try
            {
                if (tboxUsername.Text == String.Empty || tboxPassword.Text == String.Empty)
                {
                    MessageBox.Show("Polja Korisničko ime i Lozinka moraju biti popunjena!");
                }
                else
                {
                    using (DBBL data = new DBBL())
                    {
                        if (data.checkDoubleUsername(tboxUsername.Text) == true && frmUsers.korisnik.Username != tboxUsername.Text)
                        {
                            MessageBox.Show("Korisnik sa korisničkim imenom: " + tboxUsername.Text + " već postoji.");
                            tboxUsername.Focus();
                            tboxUsername.SelectAll();
                        }
                        else
                        {
                            data.updateUser(frmUsers.korisnik, tboxIme.Text, tboxPrezime.Text, tboxUsername.Text, FormsAuthentication.HashPasswordForStoringInConfigFile(tboxPassword.Text, "sha1"));
                            MessageBox.Show("Uspješno ste editovali podatke o korisniku.");
                        }
                    }
                }
            }
            catch (Exception ee)
            {
                MessageBox.Show(ee.ToString());
            }
        }