Two ways to drag a form or control

First Kind

Example of volume adjustment

#regionVolume controlPrivatePoint Mouse_offset; Private voidPicturebox7_mousedown (Objectsender, MouseEventArgs e) {Mouse_offset=NewPoint (-e.x,-e.y);//        }        Private voidPicturebox7_mousemove (Objectsender, MouseEventArgs e) {(Control) sender). Cursor= Cursors.arrow;//set mouse arrows when dragging            if(E.button = =mousebuttons.left) {point Mousepos=control.mouseposition; Mousepos.offset (Mouse_offset. X, Mouse_offset. Y);//Set OffsetMousepos.y =Pointtoscreen (picturebox7.location).                 Y Point Mouse_new=(Control) sender.                Parent.pointtoclient (Mousepos); if(Mouse_new.x <Panel1. location.x) {mouse_new.x=Panel1.                location.x; }                if(Mouse_new.x > Panel1. Width +Panel1. location.x) {mouse_new.x= Panel1. width+Panel1.                location.x; } ((Control) sender). Location=mouse_new; Panel2. Width= mouse_new.x-Panel1.            location.x; }        }        #endregion

The second Kind

namespace using System.Runtime.InteropServices;

Drag #region Form
[DllImport ("User32.dll")]
Public static extern bool ReleaseCapture ();
[DllImport ("User32.dll")]
Public static extern bool SendMessage (INTPTR hwnd, int wmsg, int wParam, int lParam);
// <summary>
// Pa_top Events
// </summary>
/// <param name= "Sender" ></param>
/// <param name= "E" ></param>
private void Pa_top_mousedown (object sender, MouseEventArgs e)
        {
releasecapture ();
SendMessage (this. Handle, 0x0112, 0xf012, 0);
        }
#endregion

Both forms and controls can be dragged in both ways

The second way is more suitable for dragging the form