C# - 練習 textBox 及 button 做等差相加、等差相乘

練習 textBox 及 button 做：

• 等差相加( textBox1 累加到 textBox2)
• 等差相乘( textBox1 累乘到 textBox2)

##ReadMore##
檔案 → 新增專案 → Windows Form 應用程式 → 拉物件 Form1.cs[設計] → 撰寫 Form1.cs
拉入 Windows Form ：

• textBox × 4
• Label × 5
• button × 1

程式：

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 test2
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void button1_Click(object sender, EventArgs e)
        {
            int sum=0, inputA, inputB;
            long multiplied = 1;
            inputA = int.Parse(textBox1.Text);
            inputB = int.Parse(textBox2.Text);
            for (int i = inputA; i <= inputB; i++)
            {
                sum = sum + i;
            }
            
            for (int j = inputA; j <= inputB; j++)
            {
                multiplied = multiplied * j;
            }
             
            textBox3.Text = sum.ToString();
            textBox4.Text = multiplied.ToString();
        }

        private void textBox1_TextChanged(object sender, EventArgs e)
        {

        }

        private void textBox2_TextChanged(object sender, EventArgs e)
        {

        }
    }
}