Uploading file into a directory

 string UserID = Session["UserID"].ToString();
            string importFileDirectory = string.Empty;
            importFileDirectory = "C:\\Inetpub\\wwwroot\\whohastwo\\Etickets\\";
           // importFileDirectory = "C:\\Etickets\\";
            //string SellerDirectory = importFileDirectory + UserID + "\\";
            string SellerDirectory = importFileDirectory + TicketId + "\\";
            if (FileEticketPdf.HasFile && Path.GetExtension(FileEticketPdf.FileName) == ".pdf")
            {
                if(!Directory.Exists(SellerDirectory))
                {
                    Directory.CreateDirectory(SellerDirectory);
                
                }
                // Replacing Filename with TicketID
                string var = FileEticketPdf.FileName;
                File = var.Replace(var, TicketId + ".pdf");
                FileEticketPdf.SaveAs(SellerDirectory + File);