How do I add a value from a database to the query string in my URL?

Please be kind and very, very explicit. I'm a total ASP.NET novice.

I've built a page with a gridview connected to a SQL database. The first column contains links to detail pages for each record. Using the DataNavigateUrlFields and DataNavigateUrlFormatString, the system passes the corresponding database key field to the Details page. The Details page is then populated with additional informationfrom the selected database record. This all works perfectly.

From the Details page, I have an hyperlink to an email form that needs to be customized based on the selected record. I know I need to pass that same database key I passed from the gridview page to the Details page to this new form via a query string. However, I don't know how to set the query string to a value retrieved from my database.

This is what I currently have:

<asp:HyperLink ID="HyperLink1" runat="server" NavigateUrl='ContactForm.aspx?MortgageOriginatorID='<%#Eval("MortgageOriginatorID")%>'>Contact Me</asp:HyperLink>

It doesn't work. But it does work when I replace <%#Eval("MortgageOriginator")%> with an actual MortgageOriginatorID value. For example:

<asp:HyperLink ID="HyperLink1" runat="server" NavigateUrl='ContactForm.aspx?MortgageOriginatorID='2'>Contact Me</asp:HyperLink>

Any advice would be GREATLY appreciate. Also, I do understand that by not obfuscating my query string, I'm opening my site up to vulnerabilities. Security is my next step. For now, I'd just like to get my links to work!

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