Asp.net webForms problem : Generate an empty pdf on production Server - asp.net

Question

In my webForm project as follow :
I have a button which user click on it
call a web method (via jquery request) to extract some binary data from sql server as pdf
Then give a user to download/view the pdf via browser.
This works for my development machine. However, this fails on production server and give to user an empty pdf!
Where is my problem & how to solve it?
Here is jquery request to my web method :
function OpenAttachment(jsonData){
$.ajax({
type: "POST",
contentType: "application/json; charset=utf-8",
url: "MedicalHistory.aspx/OpenAttachment",
data: JSON.stringify({ objData: jsonData }),
dataType: "json",
success: function (response) {
gdv.PerformCallback('downloadfile|' + response.d);
},
error: function (request, status, error) {
alert('error : ' + error);
}
});
}
Here is my web method :
[WebMethod]
public static string OpenAttachment(object objData)
{
string strResult = string.Empty;
if (objData == null)
return strResult;
DataTable dtResult = Newtonsoft.Json.JsonConvert.DeserializeObject<DataTable>(objData.ToString());
string strDocContent = dtResult.Rows[0]["DocContent"].ToString();
string strFileName = dtResult.Rows[0]["FileName"].ToString();
byte[] pdfByteArray = Encoding.Default.GetBytes(strDocContent);
HttpContext.Current.Session["_binDownloadData"] = pdfByteArray;
strResult = strFileName;
return strResult;
}
And here is download code in my download page :
object objDownloadData = Session["_binDownloadData"];
if (objDownloadData != null)
{
byte[] pdfByteArray = (byte[])objDownloadData;
string strContentType = string.Empty;
if (strFileType == "pdf")
{
strContentType = "application/pdf";
}
#region Downloading file
HttpContext.Current.Response.Clear();
MemoryStream ms = new MemoryStream(pdfByteArray);
HttpContext.Current.Response.ContentType = strContentType;
HttpContext.Current.Response.AddHeader("content-disposition", string.Format("attachment;filename={0}", strFileName));
HttpContext.Current.Response.Buffer = true;
ms.WriteTo(HttpContext.Current.Response.OutputStream);
HttpContext.Current.Response.Flush();
HttpContext.Current.Response.SuppressContent = true;
HttpContext.Current.ApplicationInstance.CompleteRequest();
#endregion
Session["_binDownloadData"] = null;
}
Thanks in advance.

Answer 1

Try with changing contentType and dataType.
$.ajax - dataType
function OpenAttachment(jsonData){
$.ajax({
type: "POST",
contentType: "application/json; charset=utf-8",
url: "MedicalHistory.aspx/OpenAttachment",
data: JSON.stringify({ objData: jsonData }),
dataType: "application/pdf",
success: function (response) {
gdv.PerformCallback('downloadfile|' + response.d);
},
error: function (request, status, error) {
alert('error : ' + error);
}
});
}