using System;
using System.Runtime.InteropServices;
using System.Windows.Forms;

namespace WindowsFormsApplication4
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        [DllImport("user32.dll")]
        static extern bool ReleaseCapture();
        [DllImport("user32.dll", CharSet = CharSet.Auto)]
        static extern IntPtr SendMessage(IntPtr hWnd, UInt32 Msg, UInt32 wParam, UInt32 lParam);

        private readonly UInt32 WM_SYSCOMMAND = 0x112;
        private readonly UInt32 SC_MOVE = 0xF010;
        private readonly UInt32 HTCAPTION = 2;

        private void button1_MouseDown(object sender, MouseEventArgs e)
        {
            ReleaseCapture();
            SendMessage(button1.Handle, WM_SYSCOMMAND, SC_MOVE + HTCAPTION, 0);
        }

        private void pictureBox1_MouseMove(object sender, MouseEventArgs e)
        {
            ReleaseCapture();
            SendMessage(pictureBox1.Handle, WM_SYSCOMMAND, SC_MOVE + HTCAPTION, 0);
        }

        private void textBox1_MouseDown(object sender, MouseEventArgs e)
        {
            ReleaseCapture();
            SendMessage(textBox1.Handle, WM_SYSCOMMAND, SC_MOVE + HTCAPTION, 0);
        }
    }
}

------解决方案--------------------
http://www.cnblogs.com/xkxjy/archive/2009/04/27/2078103.html

------解决方案--------------------

你去下载个sharpdevelop
那是仿VS软件，还是开源的