Programmatically resolving ~ URL's to the Virtual Root using ResolveURL()

It's common knowledge that a control, when Runat="server" will resolve it's src or href attribute to a virtual root when the URL starts with ~/

For example:

<a href="~/Customers/Profile.aspx" Runat="server">Profile</a>

will become:

<a href="http://yourdomain.com/site/Customers/Profile.aspx" Runat="server">Profile</a>

How do we do this programmatically?

The base WebControl class exposes a method named ResolveURL(). This method accepts a url such as "~/Customers/Profile.aspx" and returns the real url, starting from your site's virtual root.

To get to this functionality you can use the following pattern:

string url = Page.ResolveClientUrl("~/Customers/Profile.aspx");

..or..

string url = VirtualPathUtility.ToAbsolute("~/Customers/Profile.aspx");

..or..

Image x = new Image();
string url = x.ResolveUrl("~/Customers/Profile.aspx");