Error Dragdrop in Winform C#

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Why when I drag Panel shall not be automatically resized in Panel old and appears in the new Panel.

C#

private void PanelMove(object sender, MouseEventArgs e)
       {  Panel p = new Panel();
           p = (Panel)sender;
           p.DoDragDrop(p, DragDropEffects.Link);
       }


       private void PanelDragEnter(object sender, DragEventArgs e)
       {
           currentpanel = (Panel)e.Data.GetData(e.Data.GetFormats()[0]);
           currentpanelParent = (Panel)currentpanel.Parent;
           e.Effect = DragDropEffects.Link;
       }
       private void PanelDrag(object sender, DragEventArgs e)
       {
           var newpanel = new Panel();
           var newpanel2 = new Panel();
           newpanel = (Panel)e.Data.GetData(e.Data.GetFormats()[0]);
           var ParentPanel =(Panel) ((Panel)sender).Parent;
           var totalcontrol = ParentPanel.Controls.Count;
           newpanel.Height = 30;
           newpanel2 = (Panel)sender;

           if (ParentPanel != currentpanelParent)
           {
               ParentPanel.Controls.Add(newpanel);
               ParentPanel.AutoSize = true;
               currentpanelParent.Controls.Remove(currentpanel);
               currentpanel.AutoSize = true;
           }
       }

https://dm2302files.storage.live.com/y2p6qaa6OiOq-PxjDs3Kq6URy2q-mgeDSa_2HakfGsRwbRUL6hVwo7qOPJHRWlsj_K0DQtgOkQzs6j5tvLzPzi0ry-0KMm_OqZGndSYwbks2DIFi3fViSiExqtKN0c0EKlht1Sa1z7i4lCUUcGgF1274Q/Error.jpg?psid=1

Posted 2-Feb-15 15:12pm

Member 8070609

Updated 2-Feb-15 15:13pm

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InbarBarkai · Accepted Answer · 2015-02-02T18:45:00

I'm not sure what you're trying to achieve but...
You allocate new objects without using them:

C#

Panel p = new Panel()

C#

var newpanel = new Panel();
var newpanel2 = new Panel()

Drag and drop should be initialized by the containing object.
In this case (I think) it is the window?

C#

this p.DoDragDrop(p, DragDropEffects.Link);

You should look for a specific data in the drop event handler, otherwise it is an unsafe practice.

C#

if(e.Data.GetDataPresent(typeof(Panel)))
newpanel = (Panel)e.Data.GetData(e.Data.GetFormats()[0] typeof(Panel));

Try to firstly remove the panel from it's previous container and then add it to the new one.