public Form1()
{
    InitializeComponent();
    // Step 1: Add a ToolStrip to form designer, named mainToolStrip
    // Step 2: Create a second ToolStripItemCollection (you can also create individual ToolStripItems)
    ToolStripItemCollection itemCollection = new ToolStripItemCollection(mainToolStrip, new ToolStripItem[] {
    new ToolStripButton("Button 1"),
    new ToolStripButton("Button 2")});

    // Step 3: Call AddRange with the second collection
    mainToolStrip.Items.AddRange(itemCollection);  // This will cause an infinite loop
}

 public void AddRange(ToolStripItemCollection toolStripItems)
 {
     ArgumentNullException.ThrowIfNull(toolStripItems);

     if (IsReadOnly)
     {
         throw new NotSupportedException(SR.ToolStripItemCollectionIsReadOnly);
     }

     using (new LayoutTransaction(_owner, _owner!, PropertyNames.Items))
     {
         for (int i = 0; i < toolStripItems.Count; i++)
         {
             Add(toolStripItems[i]);
         }
     }
 }

using (new LayoutTransaction(_owner, _owner!, PropertyNames.Items))
    {
        // Iterate in reverse to avoid index shifting issues.
        toolStripItems.InnerList.Reverse();
        for (int i = toolStripItems.Count - 1; i >= 0; i--)
        {
            Add(toolStripItems[i]);
        }
    }