Use the ToolStripItemCollection.Clear method to remove the entire collection of controls from a parent control.
To remove an individual control from the collection, use the ToolStripItemCollection.Remove(ToolStripItem) or ToolStripItemCollection.RemoveAt(int) method.
To add new System.Windows.Forms.ToolStripItem controls to the System.Windows.Forms.ToolStripItemCollection, use the ToolStripItemCollection.Add(ToolStripItem) or ToolStripItemCollection.AddRange(ToolStripItem[]) method.