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 NoBorderForm{  public partial class Form1 : Form  {    public Form1()    {      InitializeComponent();    }        private void Form1_Load(object sender, EventArgs e)    {          }    Point mouseOff;//鼠標移動位置變量    bool leftFlag;//標記是否為左鍵    private void Form1_MouseDown(object sender, MouseEventArgs e)    {      if (e.Button == MouseButtons.Left)      {        mouseOff = new Point(-e.X, -e.Y); //得到變量的值        leftFlag = true;         //點擊左鍵按下時標注為true;      }    }    private void Form1_MouseMove(object sender, MouseEventArgs e)    {      if (leftFlag)      {        Point mouseSet = Control.MousePosition;        mouseSet.Offset(mouseOff.X, mouseOff.Y); //設置移動后的位置        Location = mouseSet;      }    }    private void Form1_MouseUp(object sender, MouseEventArgs e)    {      if (leftFlag)      {        leftFlag = false;//釋放鼠標后標注為false;      }    }    private void button1_Click(object sender, EventArgs e)    {      DialogResult dr = MessageBox.Show("yes/no", "exit", MessageBoxButtons.YesNo, MessageBoxIcon.Warning);      if (dr == DialogResult.Yes)      {        this.Close();      }      else      {        return;      }    }    private void button2_Click(object sender, EventArgs e)    {      this.WindowState = FormWindowState.Minimized;    }    private void checkBox1_CheckedChanged(object sender, EventArgs e)    {    }    private void Form1_Click(object sender, EventArgs e)    {    }    private void panel1_Click(object sender, EventArgs e)    {          }    private void textBox1_Click(object sender, EventArgs e)    {          }    private void linkLabel1_LinkClicked(object sender, LinkLabelLinkClickedEventArgs e)    {      System.Diagnostics.Process.Start("http://www.baidu.com");    }    private void button4_Click(object sender, EventArgs e)    {          }  }}