This is a general question, but I thought it might belong
here. I’m looking at a business application that requires us to draw many (in the hundreds)
slanted lines representing the production rate (quantity in time) in a
chart-like fashion. Drawing using a Canvas is very close to what I need, but it’s
missing the ability you have in the Gantt Chart where you can click a line and
move it or get some feedback from the line, like clicking it and opening
another page with the data in a grid for that line. So the elements on the
Canvas need to be “active” and “responsive” to the user action. Any suggestions
or recommendations?

Have you looked into SVG?

Thank you for the response. I know of it, but never really
played with it before. I will dig in and take a look. Do you imagine ASP.Net
SVG component of some sort, or something different?

You shouldn't necessarily need anything more for the SVG itself as it's supported by IE.

But that will give you distinct graphical elements that you can interact with, which is what it sounds like you're looking for..