Visual Studio equivalent to Delphi bookmarks

DPack can give you numbered bookmarks in VisualStudio.

Ctrl K + Ctrl K - Add/Remove Bookmark on Line
Ctrl K + Ctrl N - Go to Next Bookmark
Ctrl K + Ctrl P - Go to Previous Bookmark

There are other options as well. Look under Edit->Bookmarks menu,

More a comment on your original question than an actual answer but Delphi has had much easier to remember (and type) keyboard shortcuts than what you quote available for quite some time now:

Set bookmark 1: Ctrl-Shift-1

Go to bookmark 1: Ctrl-1

If you ever go back to Delphi, this should make your life so much easier! ;)

Cheers,

Oliver