private void LoginExecute(object parametar)
        {
            var passwordBox = parametar as PasswordBox;
            var password    = passwordBox.Password;

            try
            {
                if (MasterLogin.Login(username, password) == true)
                {
                    MessageBox.Show("Successful login");
                    MasterAdminView window = new MasterAdminView();
                    window.Show();
                    main.Close();
                }
                else if (MasterLogin.Login(username, password) == false)
                {
                    ClinicUser user = service.LoginUser(username, password);
                    if (user != null)
                    {
                        if (user.RoleId == 1)
                        {
                            if (service.FindeInstitutionByUser(user.ClinicUserId) == false)
                            {
                                MessageBox.Show("Successful login");
                                AddInstitutionView window = new AddInstitutionView(user, new Institution(), false);
                                window.Show();
                                main.Close();
                            }
                            else
                            {
                                MessageBox.Show("Successful login");
                                AdministratorView window = new AdministratorView(user);
                                window.Show();
                                main.Close();
                            }
                        }
                        else if (user.RoleId == 2)
                        {
                            MessageBox.Show("Successful login maintainanc");
                        }
                        else if (user.RoleId == 3)
                        {
                            MessageBox.Show("Successful login manager");
                        }
                        else if (user.RoleId == 4)
                        {
                            MessageBox.Show("Successful login doctor");
                        }
                        else if (user.RoleId == 5)
                        {
                            MessageBox.Show("Successful login patient");
                        }
                    }
                    else
                    {
                        MessageBox.Show("Wrong user or password credentials");
                    }
                }
            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.ToString());
            }
        }