Public ReadOnly Property StorageRoot() As String
        Get

            Dim filepath As String = HttpContext.Current.Server.MapPath("/CaseStudyImages/" & HttpContext.Current.Request.QueryString("id") & "/")

            ' Check if folder exists, if not create it
            If Not Directory.Exists(filepath) Then
                Directory.CreateDirectory(Path.GetDirectoryName(filepath))
                ' Folder created message
            End If
            'ConfigurationManager.AppSettings["StorageRoot"];
            Return filepath
        End Get
    End Property

hi,CaseStudy is folder:just check inside casestudy if folder with name of id name does not exits create it.it works for vb.net

Enjoy the code it simple n easy