excel - "File Format Is Not Valid" error while trying to export xlsx file from data table -


excel gives me error: excel cannot open file .xlsx because file format or file extension not valid.

here code:

response.appendheader("content-type", "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet")         response.appendheader("content-disposition", "attachment; filename=excel.xlsx")         response.contentencoding = encoding.unicode         response.binarywrite(encoding.unicode.getpreamble)         response.write(x.tostring)         response.end()

i believe should this.

 private sub datatabletoexcel(byval dttemp datatable)         dim _excel new microsoft.office.interop.excel.application         dim wbook microsoft.office.interop.excel.workbook         dim wsheet microsoft.office.interop.excel.worksheet          wbook = _excel.workbooks.add()         wsheet = wbook.activesheet()          dim dt system.data.datatable = dttemp         dim dc system.data.datacolumn         dim dr system.data.datarow         dim colindex integer = 0         dim rowindex integer = 0          each dc in dt.columns             colindex = colindex + 1             _excel.cells(1, colindex) = dc.columnname         next          each dr in dt.rows             rowindex = rowindex + 1             colindex = 0             each dc in dt.columns                 colindex = colindex + 1                 _excel.cells(rowindex + 1, colindex) = dr(dc.columnname)             next         next          wsheet.columns.autofit()         dim strfilename string = "c:\datatable.xlsx"         if system.io.file.exists(strfilename)             system.io.file.delete(strfilename)         end if          wbook.saveas(strfilename)         wbook.close()         _excel.quit()     end sub

http://www.authorcode.com/export-datatable-to-excel-in-vb-net/


Comments

Post a Comment

Popular posts from this blog

asynchronous - C# WinSCP .NET assembly: How to upload multiple files asynchronously -

i using winscp .net assembly uploading files. want upload multiple files asynchronous way. have created method works single upload. public class uploadingdata { private sessionoptions _sessionoptions; private session _session; //connection etc private void onconnected() { foreach (var fileinfo in localfileslist) { var task = task.factory.startnew(() => uploadfilesasync(fileinfo)); } } private async task uploadfilesasync(string file) { string remotefilepath = _session.translatelocalpathtoremote(file, @"/", "/test_data_upload"); var uploading = _session.putfiles(file, remotefilepath, false); //when done await task.run(() => thread.sleep(1000)); } } please suggest me correct way. thanks you can use backgroundworker class this: string[] images = new string[50]; foreach (var path in images) { backgroundworker
Read more

aws api gateway - SerializationException in posting new Records via Dynamodb Proxy Service in API -

i getting "__type": "com.amazon.coral.service#serializationexception" as reply in postman & in test console in api gateway trying post record directly dynamodb using api proxy services.. referring aws article - https://aws.amazon.com/blogs/compute/using-amazon-api-gateway-as-a-proxy-for-dynamodb/ here's mapping { "tablename": "tablenamegoeshere", "item": { "id" : "$context.requestid" "eventname" : "$input.path('$.eventname')", "timestamp" : $input.path('$.timestamp'), "answers": "$util.parsejson($input.path('$.answers'))" } } update: did asked ... , worked if try add array of json objects gives me above same error - here's trying now. please - couldnt find on google well #set($inputroot = $input.path('$')) { "tablename": "answer", "item": {
Read more

asp.net - Problems sending emails from forum -

i have been redesigning site has message board, has been written guy looked after site. it has few problems , written in .asp , uses .mdb files database. you can see whole thing here . feel free post if helps, test thing have set using original files , new database. the basic problem when posts message, supposed email sent them, have posted it. when replies, originator supposed message, replier has been posted. i’d have thought @ point in process there should script/file in postmessage.asp? the postmessage.asp page below. <% option explicit %> <!-- #include virtual="common/adovbs.inc" --> <html> <head> <meta http-equiv="content-type" content="text/html; charset=windows-1252"> <meta name="generator" content="microsoft frontpage 4.0"> <meta name="progid" content="frontpage.editor.document"> <title>new page 2</title> <base target="_self"
Read more