private void Btn_login_Click(object sender, EventArgs e)
        {
            API_Controller api = new API_Controller();
            string         obj = api.getAllAdmins();

            string nonHashPassword = Txt_password.Text;

            var data = Encoding.ASCII.GetBytes(nonHashPassword);

            var sha1     = new SHA1CryptoServiceProvider();
            var sha1data = sha1.ComputeHash(data);

            string hashedPassword = System.Text.Encoding.UTF8.GetString(sha1data);

            if (api.logInAdmin(obj, Txt_email.Text, hashedPassword))
            {
                this.Close();
            }
        }