System.Windows.Forms.CustomTabControl.OnDragDrop C# (CSharp) Method

        protected override void OnDragDrop(DragEventArgs drgevent)
        {
            base.OnDragDrop(drgevent);
              	        if (drgevent.Data.GetDataPresent(typeof(TabPage)))
              	        {
              	            drgevent.Effect = DragDropEffects.Move;

              	            TabPage dragTab = (TabPage)drgevent.Data.GetData(typeof(TabPage));

              				if (this.ActiveTab == dragTab){
              					return;
              				}

              	            //	Capture insert point and adjust for removal of tab
             	            //	We cannot assess this after removal as differeing tab sizes will cause
              	            //	inaccuracies in the activeTab at insert point.
              	            int insertPoint = this.ActiveIndex;
              	            if (dragTab.Parent.Equals(this) && this.TabPages.IndexOf(dragTab) < insertPoint){
              	            	insertPoint --;
              	            }
              	            if (insertPoint < 0){
              	            	insertPoint = 0;
              	            }

              	            //	Remove from current position (could be another tabcontrol)
              	            ((TabControl)dragTab.Parent).TabPages.Remove(dragTab);

              	            //	Add to current position
              				this.TabPages.Insert(insertPoint, dragTab);
              	this.SelectedTab = dragTab;

              	//	deal with hidden tab handling?
              }
        }