In C#
Response.Redirect("your_html_page.html");
In asp.net
<asp:hyperlink id="hyperlink1" navigateurl="your_html_page.html">
Text="click here" runat="server" />
</asp:hyperlink>
In html
<a href="your_html_page.html">click here</a>
In javascript
window.location="your_html_page.html";