Inserts the specified ListViewGroup into the collection at the specified index.
Assembly: System.Windows.Forms (in System.Windows.Forms.dll)
Use this method to insert an existing ListViewGroup at a particular index within the collection.
You cannot add a ListViewGroup to the collection more than once. When you call the method using a group that is already in the collection, the insertion simply fails. Use the Contains method before the insertion to determine whether a particular group is already in the collection. To reposition a group within the collection, you must first remove it, and then insert it at the desired index.