How to convert pdf in C# But another Button should bevisable

Question

 

 How to convert pdf in C# But another Button should be visable?

 

here I have done function  but i want to visible buton (Button2) after  download files . How is it posible? Plsase help me.

 

protected void Page_Load(object sender, EventArgs e)

{

 if (!Page.IsPostBack)

{

Button2.Visible = false;

} 

}

 

 

public override void VerifyRenderingInServerForm(Control control)

{

/* Verifies that the control is rendered */

}

 

private void generatetable(string filename)

{

try

{

BaseFont bfTimes = BaseFont.CreateFont(BaseFont.TIMES_ROMAN, BaseFont.CP1257, false);

Font ChronicleFont = new Font(bfTimes, 1, Font.NORMAL);

Response.ContentType = "application/pdf";

Response.AddHeader("content-disposition", "attachment;filename=" + filename + "");

Response.Cache.SetCacheability(HttpCacheability.NoCache);

StringWriter sw = new StringWriter();

HtmlTextWriter hw = new HtmlTextWriter(sw);

ftdiv.RenderControl(hw);

StringReader sr = new StringReader(sw.ToString());

Document pdfDoc = new Document(PageSize.A4.Rotate(), 25, 25, 25, 25);

HTMLWorker htmlparser = new HTMLWorker(pdfDoc);

PdfWriter writer = PdfWriter.GetInstance(pdfDoc, Response.OutputStream);

MemoryStream memoryStream = new MemoryStream();

string folderpath = "SurveyReport/" + DateTime.Now.ToString("yyyy-MM-dd") + "/";

string directoryPath = Server.MapPath(string.Format(folderpath));

if (!Directory.Exists(directoryPath))

{

Directory.CreateDirectory(directoryPath);

PdfWriter.GetInstance(pdfDoc, new FileStream(Server.MapPath(folderpath) + filename, FileMode.Create));

}

else

{

PdfWriter.GetInstance(pdfDoc, new FileStream(Server.MapPath(folderpath) + filename, FileMode.Create));

}

pdfDoc.Open();

htmlparser.Parse(sr);

pdfDoc.Close();

Response.Write(pdfDoc);

//Response.Redirect(HttpContext.Current.Request.Url.PathAndQuery);

Response.End();

}

catch

{

//System.Threading.Thread.Sleep(6000);

Button2.Visible = true;

}

}