protected override void WndProc(ref Message m)
{       const int WM_NCHITTEST = 0x84;const int HTCLIENT = 0x01;const int HTCAPTION = 0x02;if (m.Msg == WM_NCHITTEST){this.DefWndProc(ref m);if (m.Result.ToInt32() == HTCLIENT)m.Result = new IntPtr(HTCAPTION);elsebase.WndProc(ref m);}else{base.WndProc(ref m);}
}

private const int WM_NCLBUTTONDOWN = 0x00A1;
private const int WM_NCHITTEST = 0x84;
private const int HT_CAPTION = 0x2;
private const int HT_CLIENT = 0x1;private void pictureBox1_MouseDown(object sender, MouseEventArgs e)
{//this.Capture = false;pictureBox1.Capture = false;Message msg = Message.Create(Handle, WM_NCLBUTTONDOWN, (IntPtr)HT_CAPTION, IntPtr.Zero);WndProc(ref   msg);
} 

using System.Runtime.InteropServices;[DllImport("user32.dll")]public static extern bool ReleaseCapture();
[DllImport("user32.dll")]
public static extern bool SendMessage(IntPtr hwnd, int wMsg, int wParam, int lParam);public const int WM_SYSCOMMAND = 0x0112;public const int SC_MOVE = 0xF010;
public const int HTCAPTION = 0x0002;//在窗体的_MouseDown中加入如下代码:
如:
private void Form1_MouseDown(object sender, System.Windows.Forms.MouseEventArgs e)
{
ReleaseCapture();
SendMessage(this.Handle, WM_SYSCOMMAND, SC_MOVE + HTCAPTION, 0);
}

protected override void WndProc(ref Message m)
{            if (m.Msg==0x112){switch ((int) m.WParam){//禁止双击标题栏关闭窗体case 0xF063:case 0xF093:m.WParam = IntPtr.Zero;break;//禁止拖拽标题栏还原窗体case 0xF012:case 0xF010:m.WParam = IntPtr.Zero;break;//禁止双击标题栏case 0xf122:m.WParam = IntPtr.Zero;break;//禁止关闭按钮case 0xF060:m.WParam = IntPtr.Zero;break;//禁止最大化按钮case 0xf020:m.WParam = IntPtr.Zero;break;//禁止最小化按钮case 0xf030:m.WParam = IntPtr.Zero;break;//禁止还原按钮case 0xf120:m.WParam = IntPtr.Zero;break;}}            base.WndProc(ref m);
}