VitNX_TreeView.CanMoveNodes Method

protected virtual bool CanMoveNodes(List<VitNX_TreeNode> dragNodes, VitNX_TreeNode dropNode, bool isMoving = false)
 {
     if (dropNode == null)
         return false;
 
     foreach (var node in dragNodes)
     {
         if (node == dropNode)
         {
             if (isMoving)
                 VitNX_MessageBox.ShowError($"Cannot move {node.Text}. The destination folder is the same as the source folder.", Application.ProductName);
 
             return false;
         }
 
         if (node.ParentNode != null && node.ParentNode == dropNode)
         {
             if (isMoving)
                 VitNX_MessageBox.ShowError($"Cannot move {node.Text}. The destination folder is the same as the source folder.", Application.ProductName);
 
             return false;
         }
 
         var parentNode = dropNode.ParentNode;
         while (parentNode != null)
         {
             if (node == parentNode)
             {
                 if (isMoving)
                     VitNX_MessageBox.ShowError($"Cannot move {node.Text}. The destination folder is a subfolder of the source folder.", Application.ProductName);
 
                 return false;
             }
 
             parentNode = parentNode.ParentNode;
         }
     }
 
     return true;
 }