Save file in Application Folder (Directory) in ASP.Net

Hi

I want to save file in Application folder not in D:.

How it can be done.

var pdf0 = DateTime.Now.ToString("yyyyMMddHHmm") + "_" +secondPart;
var request0 = new RestRequest(@"/" + secondPart, Method.GET);
var client0 = new RestClient(firstPart);
var content = client0.DownloadData(request0);
MemoryStream ms = new MemoryStream(content);
FileStream file = new FileStream(@"D:\" + pdf0 , FileMode.Create, FileAccess.Write);
ms.WriteTo(file);
file.Close();

Thanks