title: C# Response Shows Download Unsuccessful Error on Android Browser
body: <p>I used <code>Asp.net</code> and <code>C#</code> to run this website and to approach mobile version, I used <code>jQuery</code> mobile. When I download via desktop browser is working fine and when I try to download via mobile, I got error </p>
  
  <blockquote>
    <p>Download Unsuccessful</p>
  </blockquote>
  
  <p>How can I fix it?</p>
  
  <p>Here is my code</p>
  
  <pre><code>protected void lbAttach_Click(object sender, EventArgs e)
  {
      if (this.IsPostBack)
      {                
          string sRFP = lblRFPNo.Text.ToString().Trim();
          if (dsRFP(sRFP).Tables[0].Rows[0]["Attachment"].ToString() != "")
          {
              byte[] Attach = (byte[])dsRFP(sRFP).Tables[0].Rows[0]["Attachment"];
              string strfn = Convert.ToString(dsRFP(sRFP).Tables[0].Rows[0]["AttachName"]);
              string ext = Path.GetExtension(strfn);
  
              Response.Buffer = true;
              Response.Clear();
              Response.ClearContent();
              Response.ClearHeaders();
              Response.AddHeader("Content-Disposition", "attachment; filename=\"" + strfn.ToUpper() + "\"" );
  
              //BinaryWriter bw = new BinaryWriter(Response.OutputStream);
              //bw.Write(Attach);
              //bw.Close();
              Response.ContentType = ReturnExtension(ext);
  
              try
              {
                  Response.BinaryWrite(Attach);
              }
              catch (Exception ex)
              {
                  lblMessage.Text = ex.Message;
              }
  
              Response.End();
              Response.Flush();
              Response.Close();
          }
      }
  }
  
  private string ReturnExtension(string fileExtension)
  {
      switch (fileExtension)
      {
          case ".htm":
          case ".html":
          case ".log":
              return "text/HTML";
          case ".txt":
              return "text/plain";
          case ".doc":
              return "application/ms-word";
          case ".tiff":
          case ".tif":
              return "image/tiff";
          case ".asf":
              return "video/x-ms-asf";
          case ".avi":
              return "video/avi";
          case ".zip":
              return "application/zip";
          case ".xls":
          case ".csv":
              return "application/vnd.ms-excel";
          case ".gif":
              return "image/gif";
          case ".jpg":
          case "jpeg":
              return "image/jpeg";
          case ".bmp":
              return "image/bmp";
          case ".wav":
              return "audio/wav";
          case ".mp3":
              return "audio/mpeg3";
          case ".mpg":
          case "mpeg":
              return "video/mpeg";
          case ".rtf":
              return "application/rtf";
          case ".asp":
              return "text/asp";
          case ".pdf":
              return "application/pdf";
          case ".fdf":
              return "application/vnd.fdf";
          case ".ppt":
              return "application/mspowerpoint";
          case ".dwg":
              return "image/vnd.dwg";
          case ".msg":
              return "application/msoutlook";
          case ".xml":
          case ".sdxl":
              return "application/xml";
          case ".xdp":
              return "application/vnd.adobe.xdp+xml";
          default:
              return "application/octet-stream";
      }
  }
  </code></pre>