WebUtils.ResolveUrl

Resolves of a virtual Url to a fully qualified Url. This version requires that you provide a basePath, and if returning an absolute Url a host name.

~/ ~ as base path
/ as base path
https:// http:// return as is
Any relative path: returned as is
Empty or null: returned as is

public static string ResolveUrl(string url, string basepath, 
			string currentPathForRelativeLinks, bool returnAbsoluteUrl, 
			bool ignoreRootPaths, string absoluteHostName, 
			string absoluteScheme)

Remarks

Requires that you have access to an active Request