In The MouseDown event for the control where the drag will begin, use the DoDragDrop method to kaş the veri to be dragged and the allowed effect dragging will have. For more information, see Veri and AllowedEffect. Run the yetişek and use the mouse wheel to see the values update. https://www.csharpegitimi.com.tr/2024/05/csharp-mouse-click-kullanimi.html