ASP.NET URL and Path.txt

Related Properties 

    - HttpRuntime.AppDomainAppVirtualPath
    - Request.ApplicationPath

Methods for getting physical file path:

    - System.Web.HttpContext.Current.Server.MapPath()

Methods for generating content URL:

    - System.Web.UI.Control.ResolveUrl() or Page.ResolveUrl()
    - System.Web.Mvc.UrlHelper.GenerateContentUrl()
    - System.Web.VirtualPathUtility.ToAbsolute()

Example of UrlHelper.GenerateContentUrl:

    var context = new HttpContextWrapper(HttpContext.Current);
    string url = UrlHelper.GenerateContentUrl("~/Images/photo.jpg, context);


References
  - ResolveUrl in ASP.NET - The Perfect Solution
    http://www.codeproject.com/Articles/53460/ResolveUrl-in-ASP-NET-The-Perfect-Solution