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Export to PDF using iText not displaying complete data from GridView

I am trying to export my GridView to PDF. When I click the button I can see that the document downloading with around 977KB but when it has finished download and browse to the download folder the file size then is 1KB.
This is the code I am using:
protected void ExportToPDF(object sender, EventArgs e)
{
Response.ContentType = "application/pdf";
Response.AddHeader("content-disposition",
"attachment;filename=GridViewExport.pdf");
Response.Cache.SetCacheability(HttpCacheability.NoCache);
StringWriter sw = new StringWriter();
HtmlTextWriter hw = new HtmlTextWriter(sw);
GridView1.AllowPaging = false;
GridView1.DataBind();
GridView1.RenderControl(hw);
StringReader sr = new StringReader(sw.ToString());
Document pdfDoc = new Document(PageSize.A4, 10f, 10f, 10f, 0f);
HTMLWorker htmlparser = new HTMLWorker(pdfDoc);
PdfWriter.GetInstance(pdfDoc, Response.OutputStream);
pdfDoc.Open();
htmlparser.Parse(sr);
pdfDoc.Close();
Response.Write(pdfDoc);
Response.End();
}
I am not sure what is going wrong here?
Thanks

how to save pdf on server map path using iTextsharp

i am using following code for generate pdf and it is work perfect:
string strQuery = "select * from userdata";
SqlCommand cmd = new SqlCommand(strQuery);
DataTable dt = GetData(cmd);
//Create a dummy GridView
GridView GridView1 = new GridView();
GridView1.AllowPaging = false;
GridView1.DataSource = dt;
GridView1.DataBind();
Response.ContentType = "application/pdf";
Response.AddHeader("content-disposition", "attachment;filename=GridViewExport.pdf");
Response.Cache.SetCacheability(HttpCacheability.NoCache);
StringWriter sw = new StringWriter();
HtmlTextWriter hw = new HtmlTextWriter(sw);
GridView1.RenderControl(hw);
StringReader sr = new StringReader(sw.ToString());
Document pdfDoc = new Document(PageSize.A4, 10f, 10f, 10f, 0f);
HTMLWorker htmlparser = new HTMLWorker(pdfDoc);
PdfWriter.GetInstance(pdfDoc, Response.OutputStream);
pdfDoc.Open();
htmlparser.Parse(sr);
pdfDoc.Close();
Response.Write(pdfDoc);
Response.End();
it works good. but i am able to save this pdf to on server map path.
i have written below after pdfDoc.Close();
String path = Server.MapPath("~/mypdf.pdf");
But it is not saving pdf to server map path.
how can i do this?

You are currently writing the document to the following output stream: Response.OutputStream
Once you do pdfDoc.Close();, the PDF bytes are gone.
If you want to save the PDF to the server, then you need to replace the following line:
PdfWriter.GetInstance(pdfDoc, Response.OutputStream);
With this line:
PdfWriter.GetInstance(pdfDoc, new FileStream(context.Server.MapPath("~") + "mypdf.pdf");
Now your bytes won't be sent to the browser, but the PDF will be created on your server.

Export to pdf | How to show option to open and save

I have this working code for exporting to pdf. When I export it , it asks me location to save file. Instead , I want to have option of OPEN or SAVE . Currently what I am doing is :
protected void btnPdf_Click(object sender, EventArgs e)
{
Response.ContentType = "application/pdf";
Response.AddHeader("content-disposition", "attachment;filename=UserDetails.pdf");
Response.Cache.SetCacheability(HttpCacheability.NoCache);
StringWriter sw = new StringWriter();
HtmlTextWriter hw = new HtmlTextWriter(sw);
GridView2.AllowPaging = false;
GridView2.DataBind();
GridView2.RenderControl(hw);
GridView2.HeaderRow.Style.Add("width", "15%");
GridView2.HeaderRow.Style.Add("font-size", "10px");
GridView2.Style.Add("text-decoration", "none");
GridView2.Style.Add("font-family", "Arial, Helvetica, sans-serif;");
GridView2.Style.Add("font-size", "8px");
StringReader sr = new StringReader(sw.ToString());
Document pdfDoc = new Document(PageSize.A2, 7f, 7f, 7f, 0f);
HTMLWorker htmlparser = new HTMLWorker(pdfDoc);
PdfWriter.GetInstance(pdfDoc, Response.OutputStream);
pdfDoc.Open();
htmlparser.Parse(sr);
pdfDoc.Close();
Response.Write(pdfDoc);
Response.End();
}

If you have the file on the server
Response.TransmitFile(//FILE PATH);
If you don't
Response.BinaryWrite(//Pass Byte Array)

how to export gridview image and data to PDF using asp.net or Export gridview data to PDF using asp.net

protected void Button4_Click(object sender, EventArgs e)
{
Response.ContentType = "application/pdf";
Response.AddHeader("content-disposition","attachment;filename=GridViewExport.pdf");
Response.Cache.SetCacheability(HttpCacheability.NoCache);
StringWriter sw = new StringWriter();
HtmlTextWriter hw = new HtmlTextWriter(sw);
GridView1.AllowPaging = false;
GridView1.DataBind();
GridView1.RenderControl(hw);
StringReader sr = new StringReader(sw.ToString());
Document pdfDoc = new Document(PageSize.A4, 10f, 10f, 10f, 0f);
HTMLWorker htmlparser = new HTMLWorker(pdfDoc);
PdfWriter.GetInstance(pdfDoc, Response.OutputStream);
pdfDoc.Open();
htmlparser.Parse(sr);//this is the error line
pdfDoc.Close();
Response.Write(pdfDoc);
Response.End();
}

You will have to use 3rd party control for that
Try using iText Sharp library its free
for more info go here

export gridview data to pdf

its throwing error like document has no pages.
i have written code like this.
protected void Button4_Click(object sender, EventArgs e)
{
Response.ContentType = "application/pdf";
Response.AddHeader("content-disposition","attachment;filename=GridViewExport.pdf");
Response.Cache.SetCacheability(HttpCacheability.NoCache);
StringWriter sw = new StringWriter();
HtmlTextWriter hw = new HtmlTextWriter(sw);
GridView1.AllowPaging = false;
GridView1.DataBind();
GridView1.RenderControl(hw);
StringReader sr = new StringReader(sw.ToString());
Document pdfDoc = new Document(PageSize.A4, 10f, 10f, 10f, 0f);
HTMLWorker htmlparser = new HTMLWorker(pdfDoc);
PdfWriter.GetInstance(pdfDoc, Response.OutputStream);
pdfDoc.Open();
htmlparser.Parse(sr);
pdfDoc.Close();
Response.Write(pdfDoc);
Response.End();
}
can any1 help me on this

I suggest reading the documentation of the library you are using.
The error suggests that you need to add a page to the new document before you try and add content to it.
In some of the PDF libraries you add a page and then need to set it as the current page before adding content.