Refresh Page after DropDownList Selected Index Changed Event Fired

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hi.....
when i selected value="Pdf" it executes successfully but after that when am going to select Value="Word" event is not fired (also written autopostback="true")

below is the code any body knows pl....z Reply......

C#

protected void ddl_chanched(object sender, EventArgs e)
       {

               if (DropDownList1.SelectedValue == "Pdf")
               {
                   Document pdfDoc = new Document(PageSize.A4, 10f, 10f, 10f, 0f);
                   PdfWriter.GetInstance(pdfDoc, Response.OutputStream);
                   pdfDoc.Open();
                   using (MemoryStream stream = new MemoryStream())
                   {
                       Chart1.SaveImage(stream, ChartImageFormat.Png);
                       iTextSharp.text.Image chartImage = iTextSharp.text.Image.GetInstance(stream.GetBuffer());
                       string lbl1 = Label1.Text.ToString();
                       pdfDoc.Add(new Paragraph(lbl1));
                       chartImage.ScalePercent(75f);
                       pdfDoc.Add(chartImage);
                       pdfDoc.Close();

                       Response.ContentType = "application/pdf";
                       Response.AddHeader("content-disposition", "attachment;filename=Chart.pdf");
                       Response.Cache.SetCacheability(HttpCacheability.NoCache);
                       Response.Write(pdfDoc);

                       Response.End();








                   }


           }
           else if (DropDownList1.SelectedValue == "Word")
           {

                   Page.Response.Redirect(HttpContext.Current.Request.Url.ToString(), true);
                   string tmpChartName = "test2.jpg";
                   string imgPath = HttpContext.Current.Request.PhysicalApplicationPath + tmpChartName;

                   Chart1.SaveImage(imgPath);
                   string imgPath2 = Request.Url.GetLeftPart(UriPartial.Authority) + VirtualPathUtility.ToAbsolute("~/" + tmpChartName);

                   Response.Clear();
                   Response.ContentType = "application/vnd.ms-word";
                   Response.AddHeader("Content-Disposition", "attachment; filename=test.doc;");
                   StringWriter stringWrite = new StringWriter();
                   HtmlTextWriter htmlWrite = new HtmlTextWriter(stringWrite);
                   string headerTable = @"<table><tr><td><img src='" + imgPath2 + @"' \></td></tr></table>";
                   Response.Write(headerTable);
                   Response.Write(stringWrite.ToString());
                   Response.End();
               }
           }
           }

Posted 12-Sep-12 19:18pm

Ashok Guntoju

Updated 12-Sep-12 19:54pm

__TR__

v2

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Comments

Kuthuparakkal 13-Sep-12 1:50am

Put break point on ddl_chanched event and examine the Dropdown selected value, you may have some spaces or something different from "Word" like "word" or any such case sensitive issue.

madhuri@mumbai 13-Sep-12 2:10am

hello mr, he says that event not fired then after selecting word,so how you can say that "Word" different than "word",event not fired here so,its doesn't go inside.

3 solutions

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_Amy · Answer 1 · 2012-09-12T20:04:00

Your dropdown is firing the event. Only thing is it is not going inside word block(else...if block). It may be because of string matching. May be you have given value in small case and checking in different case. In this kind of situations always use breakpoint and try stepping through the code.
Try this:

C#

protected void ddl_chanched(object sender, EventArgs e)
{    
    if (DropDownList1.SelectedValue.ToUpper == "PDF")
    {
        Document pdfDoc = new Document(PageSize.A4, 10f, 10f, 10f, 0f);
        PdfWriter.GetInstance(pdfDoc, Response.OutputStream);
        pdfDoc.Open();
        using (MemoryStream stream = new MemoryStream())
        {
            Chart1.SaveImage(stream, ChartImageFormat.Png);
            iTextSharp.text.Image chartImage = iTextSharp.text.Image.GetInstance(stream.GetBuffer());
            string lbl1 = Label1.Text.ToString();
            pdfDoc.Add(new Paragraph(lbl1));
            chartImage.ScalePercent(75f);
            pdfDoc.Add(chartImage);
            pdfDoc.Close(); 
            Response.ContentType = "application/pdf";
            Response.AddHeader("content-disposition", "attachment;filename=Chart.pdf");
            Response.Cache.SetCacheability(HttpCacheability.NoCache);
            Response.Write(pdfDoc);                        
            Response.End();
        }       
    }
    else if (DropDownList1.SelectedValue.ToUpper() == "WORD")
    {       
        Page.Response.Redirect(HttpContext.Current.Request.Url.ToString(), true);
        string tmpChartName = "test2.jpg";
        string imgPath = HttpContext.Current.Request.PhysicalApplicationPath + tmpChartName;

        Chart1.SaveImage(imgPath);
        string imgPath2 = Request.Url.GetLeftPart(UriPartial.Authority) + VirtualPathUtility.ToAbsolute("~/" + tmpChartName);

        Response.Clear();
        Response.ContentType = "application/vnd.ms-word";
        Response.AddHeader("Content-Disposition", "attachment; filename=test.doc;");
        StringWriter stringWrite = new StringWriter();
        HtmlTextWriter htmlWrite = new HtmlTextWriter(stringWrite);
        string headerTable = @"<table><tr><td><img src="" + imgPath2 + @""></img></td></tr></table>";
        Response.Write(headerTable);
        Response.Write(stringWrite.ToString());
        Response.End();
    }
    DropDownList1.AutoPostBack = true;
}

Hope it helps.
--Amit

jasmin_patel · Answer 2 · 2012-09-12T20:17:00

Solution 2

When your Dropdown selected index change at that time first page_load event fired so put the break point at page_load event and check if here you set selected index become 0 or first of the dropdown values.

Posted 12-Sep-12 20:17pm

jasmin_patel

Ashok Guntoju · Answer 3 · 2012-09-14T01:01:00

Solution 3

Hi,
The problem is because of response object that ends on every block of condition . There is no place to return true to make control do post-back.

Posted 14-Sep-12 1:01am