public static string CombineToPhysicalPath(this IFolder folder, params string[] paths)
{
folder.ArgumentNullExceptionByNullOrEmpty("folder");
var path = folder.Combine(paths);
return(PathUtility.VirtualPathSeparatorCharConvertToPhysicsPathSeparatorChar(Path.Combine(folder.Root.RootPhysicalPath, path.TrimStart('/'))));
}