Asp.net Using Oledb To Export Excel File Returns Empty Excel File

Feb 24, 2010

I am using asp.net oledb to export information to excel file. I encounter problems when the information to export becomes too big, in this case the code I have given below, the excel file generated becomes an empty spreadsheet.If I changed the loop to 1123 for insertion of the rows. The generated excel file is fine, 1125 rows, and 4 columns shown.A test program in windows form is also working fine regardless of how many rows.[code]I couldn't find a solution to my problem as well. What I did eventually was to run the process using another separate windows service. The code works perfectly fine running from a windows form or service program, but not asp.net, not sure why.

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Read Empty Excel File Using OleDb?

Nov 15, 2011

Using OleDbDataReader, how does one determine if the Excel workbook is empty? BTW, OleDbDataReader.HasRows seems to always be True even for a workbook with no data.

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Export To Excel Excel Could Not Open The File Because The File Format Is Not Valid?

May 8, 2012

I have this issue that occurs with me and driving me crazy i have a report that contains thousands of records and i need to export it to excel , but the excel normal extension .xls

is showing missing records at the end of the file , so i save my file as an .xlsx extension it saves correctly but when i open the file it generates an error

"Excel cannot open the file '<var>filename</var>.xlsx' because the file format for the file extension is not valid. Verify that the file has not been corrupted and that the file extension matches the format of the file."but when i test the file i drag it and open it in an empty notepad all the records shows up correctly

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Excel OleDb - Set Up The Excel Test File?

Sep 24, 2010

Im looking into learning OLEdb to run with Excel, Where do i start? has anyone got the full default sample code? and how do i need to set up the Excel test file. Sounds daft but im looking at the system namespace for it and its just looking bafling. What not to put on an Employee evaluation: This employee has hit rock bottom and shows signs of starting to dig.

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Export An Image Into An Excel File Without Excel Installed?

Oct 7, 2011

I need to export Chart(image) and grid (tabular) row data into excel file. I can not use automation because Office tools are not installed in my server. I've found a bunch of free/proprietary tools like:

NPOI
MyXLS
ExcelWriter (softartisans)
JetCell (DevTrio)
Aspose.Cells (Aspose)

But I do not know which one is better for my needs. I need to export not only grid row data but also Chart (image), thats why I am thinking about.

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Asp.net - Export To Excel File As .zip To Reduce File Size - Compress Xmldata Before Sending It To The Client?

Jul 8, 2010

I like to compress the xmldata before the data is provided to the client as an excel file. I am trying to compress and deliver it as a .zip file. its not working Here's my code below. I tried compressing it, converting it to bytes etc etc. The issue with below code is, the XSL transformation is not happening properly and the output excel file is raw xml with some .net exception at the end. (that's what I see on the .xls file that's downloaded at the end) Before I started working on compression my below code was working fine that gives properly formatted excel file from the xml input. the excel file is so nice you can't even tell it was from XML.

[Code]...

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Oledb To Read Excel File

Jun 22, 2010

I have always used Excel.interop before but I thought oledb would be simpler because, for this application, I only have to read the data which it can't seem to do. It accesses the file alright because I can't open the file while I am at a breakpoint. It attempts to read the file because oExcelReader.fieldcount = 14 which is correct. oExcelReader.hasrows = true which is not correct. The line where I use getstring(1) errors out and says there is no data for this row/column.

[Code]...

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Update Excel File Via OLEDB?

Aug 13, 2009

I have some excel file, where I have to programatically delete all hidden columns.The problem if that, when I receive these files, the cells are mainly formulas, and as I delete some columns I get some "#REF#" problems.

I thought a bit about the problem an decided to create a function that loops throught all cells and replace the value by its own value, before deleting the columns, via OLEDB:

dt.Rows(row)(col) = dt.Rows(row)(col).ToString I don't know if this works. So I followed an update example I found in google, but it doesn't work:

Dim conexao_Excel As String = "Provider=Microsoft.Jet.OleDb.4.0;data source=" & fileName & ";Extended Properties=""Excel 8.0;HDR=Yes;IMEX=1;"""

cn = New OleDbConnection(conexao_Excel)
cn.Open()
da = New OleDbDataAdapter("SELECT * FROM [" & sheetname & "]", cn)
da.Fill(dt)

[Code]...

"Update requires a valid UpdateCommand when passed DataRow collection with modified rows." I image this is pretty basic, but I have already lost so much time on this issues...

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Check the Excel File Is Opned Or Not When I Try To Export As Same File Name Again?

May 22, 2009

A user exported a excel file and he opened it.Some reason, he tried to export same exel file as same name.Then, the application is gone because it does not know what do with it.How do I check the excel file is opned or not when I try to export as same file name again?

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Limitations Of OLEDB Connection When Reading Excel File?

Feb 15, 2012

I have this program that uses OLEDB connection to import excel file to data table then use it in other functions.Now I have this question: What are the possible limitations of OLEDB when it reads the Excel file. The File is on xls format, and I want to know if there is such limitations(for example: It has limitation in reading value on a cell).

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OleDB Lines - Excel And Text File Updates

Dec 4, 2009

I've done successful updates to Access databases with VB.net code using OleDb lines, with some sample code as follows:
Dim GRDatabase As OleDbConnection = New OleDbConnection("Provider=Microsoft.jet.oledb.4.0;data source=|DataDirectory|OWVGuestRegister.mdb")
Dim GRCommand As OleDbCommand
GRDatabase.Open()
[Code] .....
How to update Excel and Text files the same way?

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Read An Excel File Without Using OLEDB Connection String?

Jun 8, 2012

How to read an Excel file without using OLEDB connection string?

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Read Specific Cell From Excel File Using OLEDB Connection?

Mar 9, 2010

How can I read specific cell from Excel file using OLEDB Connection with VB.NET?

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Asp.net - Export Gridview To Excel File?

Nov 11, 2011

i have this code it keeps giving me error

Protected Sub Button2_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles Button2.Click
Dim response As HttpResponse = HttpContext.Current.Response()
response.Clear()
response.AddHeader("content-disposition", "attachment;filename=XXXXXX.xls")

[Code]....

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Export A Datagridview To Excel (.xls) File?

Jun 10, 2007

I have done a google and see that many people have asked the question on how to export a Datagridview to a Excel (.xls) file. For some reason I cannot seem to get it to work (i have gotton the program to open an Excel and save it, all hidden in the background). I use a bit of the coding from this source code [URL] but modified it and incorporated it into my program. It connects an OLE Database connection with the excel sheet... but what i want to do is beable to alter the sheet in the datagridview and export it back to an excel sheet. I am not trying to sound pushy when i say this but... if you download the source file i am using you will get a really good idea of my situation..

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Export Data To Excel File

Nov 30, 2011

I'm using vb2008 I ried this code to print data from my project to Excel file if the File is open . but didn't success

[Code]....

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Export Datagrid Into Excel File?

Jan 11, 2007

I am working on a windows application using vb.net 2003. I am required to export my datagrid onto a excel file. I just need a button.

This is my code to populate the datagrid.

Code:
Dim connectionString As String
connectionString = "DRIVER={MySQL ODBC 3.51 Driver};" + "SERVER=localhost;" + "DATABASE=luckyspin;" + "UID=root;" + "PASSWORD=123;" + "OPTION=3"

[Code]....

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Export DataGrid To Excel File?

Aug 6, 2011

I need some easy/basic way to export DataGrid to Excel file and also to be able later to Import this file back to DataGrid. Nothing complicated its simple table with values amount of columns won't change.

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Export From Sql Server To Excel File Using Asp.net?

Apr 11, 2011

is there a way to export the whole data in one table from sql server 2008 directly using asp.net and vb.net without using datagridview to EXCEL FILE?

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Export LB To Specific Excel File?

Apr 25, 2012

So I load some excel data into a LB and can manipulate it, at this point I want to export the data back into excel and do so with the following button:

Public Sub Button4_click(ByVal sender As Object, e As System.EventArgs) Handles Button4.Click
ListBox1.Sorted = True

[Code].....

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Export Sql Query To Excel 97 File?

Jan 17, 2012

I have a desktop app, I use this code to create a .xls file using a FileStream object:

Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
Dim i As Integer

[code].....

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Read A .txt File And Export To Excel?

Jan 6, 2012

I need to read a .txt file and then put that into fields in an excel spreadsheet. for example i get print spool files that have invoices on them i need to put the customer names into a column of customer names and their addresses into a column of addresses. here is what i wrote to read with:

Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
Dim reader As New System.IO.StreamReader(TextBox1.Text)

[Code]....

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Export Data From DataGridView To Excel File?

Jun 8, 2009

i have a form with DataGridView to show table from database. is it possible for me to add a button then when click, the data from the DataGridView will export to a new excel file?? if possible, can teach me how to do it?

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Export Data From Project To Excel File?

Dec 2, 2011

I'm using vb.net 2008 - Ms excel 2007

I'm trying to export data from my project to excel file called ta1 in "C" hard

The first code to open the file and print data to it. it worked with me very well

The second code is to print the data when the file it opened. It didn't work with me

First Code-Work very well
Dim exl As New Excel.Application
Dim exlWorkSheet As Excel.Worksheet

[Code]....

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Export Datagridview Data To Excel File?

Jun 6, 2011

am having problem in saving datagridview data to excel file.. i have import excel namespace into my project but it shows

error : Namespace or type specified in the Imports 'class2' doesn't contain any public member or cannot be found. Make sure the namespace or the type is defined and contains at least one public member. Make sure the imported element name doesn't use any aliases.

Imports Excel = Microsoft.Office.Interop.Excel
Dim xlApp As Excel.Application
Dim xlWorkBook As Excel.Workbook

[Code].....

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Export An Integer Value From 2008 To An Excel File Cell?

Feb 25, 2008

I am using VB2008 and have an integer value.How do I export it to an exisitng Excel file, I want to put it in a specific cell.Also, I may have the need to do this for an array in which I would like to put in in consecutive cell in Excel.

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Export Data From Gridview To An Existing Excel File?

Apr 7, 2012

I need to save the results of each search that I run on my database, into an excel file. So it is an iterative process where the new search results are added on as new rows to the excel file in each export. I am running the following code which works perfectly fine but for the fact that each export is saved to a newly created excel file.[code]...

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Export Data To Excel And Update File Contents?

Jun 2, 2010

This is the code that I have to export data to Excel.
Dim oExcel As Object
Dim oBook As Object
Dim oSheet As Object
oExcel = CreateObject("Excel.Application")
oBook = oExcel.Workbooks.Add
[Code] ....
I can create and save the excel file, but I can't update the contents.

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Export Sql 2005 Data To Excel File Using VB 2008?

Dec 27, 2010

I have created an vb.net application in which ,I want to export sql table data to excel.

On form I have used one button namely "Export to Excel".

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Import A Tab Delimited File Into Excel And Export It Back

Sep 24, 2009

I have to import a tab delimited file into Excel and export it back out to correct a formatting issue caused by FoxPro. I need to pad a column with 10, Zeros and that is good with this here: objxl.columns("B:B").numberformat="0000000000". However I have 2 cells in the sheet, row 1B and 2B that I want to exclude from the number format above. Because it is a date field and it writes to that same column so it pads my date. I do have a need to Pad that date field with mmddyyyy so I have to pad it 8 - zeros.

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