c# - Why when I download gridview in pdf file, it shows error -


i want download pdf file contain pid, , month january december.

the month contain float number has 9 number after comma, makes gridview wider should be. , when download pdf file, shows error 'system.web.ui.htmltextwriter'

what happening here?

this code

 connection.open();   sqlcommand dm = new sqlcommand("select id,sum (case when [month] = 1 demand else 0.0 end) january, sum(case when [month] = 2 demand  else 0.0 end) february,sum(case when [month] = 3 demand  else 0.0 end) march ,sum(case when [month] = 4 demand  else 0.0 end) april ,sum(case when [month] = 5 demand  else 0.0 end) may ,sum(case when [month] = 6 demand  else 0.0 end) june ,sum(case when [month] = 7 demand  else 0.0 end) july ,sum(case when [month] = 8 demand  else 0.0 end) august ,sum(case when [month] = 9 demand  else 0.0 end) september ,sum(case when [month] = 10 demand  else 0.0 end) october ,sum(case when [month] = 11 demand  else 0.0 end) november ,sum(case when [month] = 12 demand  else 0.0 end) december reorder group id", connection);     sqldatareader fdm = dm.executereader();      if (fdm.hasrows)     {         fdm.read();         gridview3.datasource = fdm;      }     connection.close();      response.contenttype = "application/pdf";     response.addheader("content-disposition", "attachment;filename=demand.pdf");     response.cache.setcacheability(httpcacheability.nocache);     stringwriter wsfdm = new stringwriter();     htmltextwriter fdmws = new htmltextwriter(wsfdm);     gridview3.allowpaging = false;     gridview3.rendercontrol(fdmws);     gridview3.headerrow.style.add("width", "20%");     gridview3.headerrow.style.add("font-size", "8x");     gridview3.style.add("text-decoration", "none");     gridview3.style.add("font-family", "arial, helvetica, sans-serif;");     gridview3.style.add("font-size", "8px");      stringreader fgdm = new stringreader(fdmws.tostring());     document documentpdf = new document(pagesize.a4, 10f, 10f, 10f, 0f);     htmlworker htmlparser = new htmlworker(documentpdf);     pdfwriter.getinstance(documentpdf, response.outputstream);     documentpdf.open();     htmlparser.parse(fgdm);     documentpdf.close();     response.write(documentpdf);     response.end(); }

you have use stringwriter object in stringreader class instead of htmltextwriter

try this

    connection.open();     sqlcommand dm = new sqlcommand("select id,sum (case when [month] = 1 demand else 0.0 end) january, sum(case when [month] = 2 demand  else 0.0 end) february,sum(case when [month] = 3 demand  else 0.0 end) march ,sum(case when [month] = 4 demand  else 0.0 end) april ,sum(case when [month] = 5 demand  else 0.0 end) may ,sum(case when [month] = 6 demand  else 0.0 end) june ,sum(case when [month] = 7 demand  else 0.0 end) july ,sum(case when [month] = 8 demand  else 0.0 end) august ,sum(case when [month] = 9 demand  else 0.0 end) september ,sum(case when [month] = 10 demand  else 0.0 end) october ,sum(case when [month] = 11 demand  else 0.0 end) november ,sum(case when [month] = 12 demand  else 0.0 end) december reorder group id", connection);     sqldatareader fdm = dm.executereader();      if (fdm.hasrows)     {         fdm.read();         gridview3.datasource = fdm;      }     connection.close();      response.contenttype = "application/pdf";     response.addheader("content-disposition", "attachment;filename=demand.pdf");     response.cache.setcacheability(httpcacheability.nocache);     stringwriter wsfdm = new stringwriter();     htmltextwriter fdmws = new htmltextwriter(wsfdm);     gridview3.allowpaging = false;     gridview3.rendercontrol(fdmws);     gridview3.headerrow.style.add("width", "20%");     gridview3.headerrow.style.add("font-size", "8x");     gridview3.style.add("text-decoration", "none");     gridview3.style.add("font-family", "arial, helvetica, sans-serif;");     gridview3.style.add("font-size", "8px");      stringreader fgdm = new stringreader(wsfdm.tostring());     document documentpdf = new document(pagesize.a4, 10f, 10f, 10f, 0f);     htmlworker htmlparser = new htmlworker(documentpdf);     pdfwriter.getinstance(documentpdf, response.outputstream);     documentpdf.open();     htmlparser.parse(fgdm);     documentpdf.close();     response.write(documentpdf);     response.end(); }

source:

take @ here export-gridview-to-pdf


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