Gets or sets a value indicating whether drag-and-drop and item reordering are handled through events that you implement.
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Set the ToolStripItem.AllowDrop property to true and set the ToolStrip.AllowItemReorder property to false to respond to drag-and-drop behavior you have defined in the ToolStripItem.DragEnter, ToolStripItem.DragLeave, and ToolStripItem.DragDrop events.
Set the ToolStripItem.AllowDrop property to false and set the ToolStrip.AllowItemReorder property to true to cause the System.Windows.Forms.ToolStripItem class to handle drag-and-drop and item reordering privately.
Setting both the ToolStripItem.AllowDrop and the ToolStrip.AllowItemReorder properties to true throws an exception.