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

namespace _20160119張老師作業
{
    public partial class Form1 : Form
    {
        Point p;
        public Form1()
        {
            InitializeComponent();
        }

        private void button1_MouseDown(object sender, MouseEventArgs e)
        {
            p = e.Location;
        }

        private void button1_MouseUp(object sender, MouseEventArgs e)
        {
            p = e.Location;
        }

        private void button1_MouseMove(object sender, MouseEventArgs e)
        {
            if (e.Button == System.Windows.Forms.MouseButtons.Left)
                this.button1.Location = new Point(this.button1.Left + (e.X - p.X), this.button1.Top + (e.Y - p.Y));

        }
    }
}