C # Control Drag

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[DllImport( "user32.dll" , EntryPoint =  "ReleaseCapture" )] public static extern void ReleaseCapture(); [DllImport( "user32.dll" , EntryPoint =  "SendMessage" )] public static extern void SendMessage( int hwnd,  int wMsg,  int wParam,  int lParam);

Load the above statement into the form class file and add an event to the dragged control, such as I am a panel

privatevoidpanelForm_MouseDown(objectsender, MouseEventArgs e)        {            if(e.Button == MouseButtons.Left)            {                ReleaseCapture();                SendMessage((int)移动的对象.Handle, 0xA1, 2, 0);                //是窗体自身就是                //SendMessage((int)this.Handle, 0xA1, 2, 0);                //panel就是SendMessage((int)panel1.Handle, 0xA1, 2, 0);            }        }

This is the Windows standard drag-and-drop event, the following, drag the time the window is flashing constantly, has been rendering the background

C # Control Drag