private void BtnRegister_Click(object sender, EventArgs e)
        {
            try
            {
                IUserService service = new UserServiceClient();
                DemoUserDto userData = new DemoUserDto
                    {
                        UserName = txtUserName.Text,
                        PassWord = txtPassWord.Text,
                        Email = "*****@*****.**"
                    };

                DemoUserDto user = service.RegisterUserByDto(userData);
                MessageBox.Show(user.ToString());
            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.ToString());
            }
        }