Extending C# Listview with Collapsible Groups

NOTE: This post is kinda long. However, most of the length is a result of code postings (even after removing some extra stuff). Bear with me!

I’ve been deep in a project for work for the past two months. Sadly, it is nothing sexy, no exciting bleeding-edge technology, just another enterprise database, using the very mature and slightly dull Winforms library in the .NET platform.

However, I did stumble across an interesting project requirement for what is essentially an expandable group of the venerable Listview control, what one might get if one combined a Listview with a Treeview, or if the “groups” built into the Listview control could be expanded/collapsed, right-clicked, etc.

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