Rich Text - MS Access to Windows Forms rich text box - ms-access

Question

I have an MS Access database that has been upgraded over the years to 2016. I’ve been tasked with converting the data & system into a Sql Server database & Windows forms (C#). Most of the original text in MS Access is rich text. I have been able to read the data out of access & store it in Sql Server no problem. But when I read it out of Sql Server and try to load it into a RichTextBox it generates a “File format is not valid” error. The line of code that is problematic is:
rtb.Rtf = dr["req_sum_desc"].ToString().Trim();
Of course if I use the .Text property it sees the mark up tags as part of the string. When I look at what was originally stored as rich text in MS Access it looks more like HTML. Here is the beginning of a sample:
<div><font face=Arial size=2>Request for 68 FTEs, 25 faculty and 43 staff,
E&G funded</font></div><div> </div><div><font face=Arial
size=2>Instruction </font></div><div><font face=Arial size=2>Faculty
hiring has increased to address enrollment growth to meet student demand
for courses to shorten time to graduate. &nbsp .....
I've tried using a webbrowser control & the clipboard to convert it to a richtext string ...
WebBrowser web = new WebBrowser();
web.DocumentText = dr["req_sum_desc"].ToString().Trim();
web.Document.ExecCommand("SelectAll", false, null);
web.Document.ExecCommand("Copy", false, null);
rtb.Paste();
But that just gave me the field in the DocumentText rather than the contents of the field (really weird).
I've been looking for a windows control that can handle both HTML & RTF.
Does anyone have any ideas or solutions?