WinForms, WPF, or ... ?
Are you looking for something like this: WinForms: [
^], or, [
^].
This CP "great classic" WinForm article "A Much Easier to Use ListView,"
By Phillip Piper[
^] is an extended ListView, but does support "grouping." It has been on CP since 2006, and has been revised/updated numerous times, most recently in July of 2011. The author continues to reply to questions on this article as of this month !
Or, WPF, like this: [
^].