Using HtmlAnchor or ASP.NET HyperLink for anchor tag that navigates in-page named anchor

Instead of using the NavigateUrl property, just use the href property

<asp:HyperLink href="#namedAnchor" runat="server">HyperLink</asp:HyperLink>

To set the HREF property in codebehind:

HyperLink link = new HyperLink();
link.Attributes.Add("href", "#" + doc.DocumentID.ToString());
link.Text = doc.DocumentNumber;

This will give you:

<a href="#111">blah blah</a>

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