无Border可移动窗体

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 NoBoarder
{
    public partial class FormParent : Form
    {
        public FormParent()
        {
            InitializeComponent();
        }

        protected bool isMouseDown = false;
        protected Point FormLocation;
        protected Point mouseOffset;

        private void FormParent_MouseDown(object sender, MouseEventArgs e)
        {
            if (e.Button == MouseButtons.Left)
            {
                isMouseDown = true;
                FormLocation = this.Location;
                mouseOffset = Control.MousePosition;

            }  
        }

        private void FormParent_MouseMove(object sender, MouseEventArgs e)
        {
            int x = 0;
            int y = 0;
            if (isMouseDown)
            {
                Point pt = Control.MousePosition;
                x = mouseOffset.X - pt.X;
                y = mouseOffset.Y - pt.Y;
                this.Location = new Point(FormLocation.X - x, FormLocation.Y - y);
            }  
        }

        private void FormParent_MouseUp(object sender, MouseEventArgs e)
        {
            isMouseDown = false; 
        }
    }
}

        将Form的FormBorderStyle设置为None, 运行就是没边界的窗口可移动的窗口啦

　　程序中多个无Border的窗口就可以直接继承这个类就可以了, 为了便于理解, 这个继承自Form的类叫FormParent, 且在上面添加一个Button, Text = "ParentForm"

　　其Click事件添加代码

private void button1_Click(object sender, EventArgs e)
        {
            FormSon f = new FormSon();
            f.Show();
            this.Hide();
        }

　　新建一个Windows Form, 取名叫FormSon, 让其继承于FormParent

public partial class FormSon : FormParent //!!!!!!!!!!!!!!!!!!!!!!!!!!!!
    { 
        public FormSon()
        {
            InitializeComponent();
        }
    }

　　运行程序点击FormParent就会弹出一模一样的FormSon出来, 说明还真是亲生的

　　但是人总是要有个性的, 我们修改FormSon的Button控件, 发现修改不了, 其实这不是家族遗传病, 是因为FormParent的Modifires属性设置为了Private, 改成Public就可以啦！