Download any file in asp.net with c#

private void Downloadfile()
{
System.IO.FileInfo file = new System.IO.FileInfo(@"D:\csv.csv");

if (file.Exists)
{

Response.Clear();
Response.AddHeader("Content-Disposition", "attachment; filename=" + file.Name);

Response.AddHeader("Content-Length", file.Length.ToString());

Response.ContentType = "application/octet-stream";

Response.WriteFile(file.FullName);

Response.End();

}

}