Url.Content in asp.net web-forms

I'm trying to do this:

<a href="~/Cases/SupRequestSearch.aspx">Search request</a>

so I need the ~ to be rendered as http://myserver/app/...

in mvc I would do

<a href="<%=Url.Content("~/Cases/SupRequestSearch.aspx")%>>Search request</a>

is there something similar in asp.net web forms ?