using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;

namespace WindowsFormsApplication1
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();

        }

        private void button1_Click(object sender, EventArgs e)
        {
            int buy=0,num,total=0;
            string item;
            if (radio1.Checked)
            {
                buy = 15;
                item = "น้ำส้ม";
            }
            if (radio2.Checked)
            {
                buy = 20;
                item = "น้ำมะนาว";
            }
            if (radio3.Checked)
            {
                buy = 25;
                item = "น้ำมะพร้าว";
            }

            num = int.Parse(txtbMoney.Text);
            total = num - buy;

            if (total >= 0)
            {

               lblResult.Text = string.Format("จำนวนเงิน {0} บาท \nซื้อ {1} {2} บาท\nเงินทอน {3}          บาท", num.ToString("#,##0.#0"), item , buy.ToString("#,##0.#0"), total.ToString("#,##0.#0"));
            }
            else
            {
                lblResult.Text = "จำนวนเงินไม่พอ";
            }


        }

        private void txtbMoney_TextChanged(object sender, EventArgs e)
        {
            if (txtbMoney.Text == "")
            {
                button1.Enabled = false;
            }
            else
            {
                button1.Enabled = true;
            }
        }

    }
}