Open PDF file at client side from actual location

See more:

C#

ASP.NET

Scenario:
Actually i want to open PDF at client side in editable mode
my code, open pdf file in editable mode without open/save dialog box
but after i finish changes in pdf when i save pdf, pdf saves in TemporaryFiles.

i have pdf writer installed on client machine

how can i open it from server location to client ?

Please help

here what i tried

protected void btnway2_Click(object sender, EventArgs e)
  {
      string path = MapPath("1.pdf");
      System.Net.WebClient client = new System.Net.WebClient();
      Byte[] buffer = client.DownloadData(path);

      if (buffer != null)
      {
          Response.ContentType = "application/pdf";
          Response.AddHeader("content-length", buffer.Length.ToString());
          Response.BinaryWrite(buffer);
      }

  }

Means after i save PDF file, it should replace existing file at server.