MappedApplicationPath function(asp.net code)

public static string MappedApplicationPath
{
get
{
string APP_PATH = System.Web.HttpContext.Current.Request.ApplicationPath.ToLower();
if(APP_PATH == "/") //a site
APP_PATH = "/";
else if(!APP_PATH.EndsWith(@"/")) //a virtual
APP_PATH += @"/";

string it = System.Web.HttpContext.Current.Server.MapPath(APP_PATH);
if(!it.EndsWith(@"\"))
it += @"\";
return it;
}
}