调用API 
   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;  
  
 在空间的_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); 
  }