Multithreading Errors With Excel Workbook?
Aug 26, 2009
I have a .Net program that responds to worksheet updates of an Excel 2003 workbook. Sometimes when the worksheet is updated and I try to write related data to my forms, I'm getting "Cross-thread operation not valid...." errors. This confuses me, as I have never done any multi-threading in my program. Does the mere act of me responding to events of an external excel worksheet mean I am now multithreading? Is there a way to handle the events without multithreading?
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Jan 6, 2011
In building an Excel workbook with VB.Net, is it possible to sort all the worksheet tabs into a particular order? I'm building a workbook with individual sheets named by drive letter, i.e., "C Drive", "D Drive", etc.
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Aug 3, 2009
I use the following code snippet
Dim exlapp As New Microsoft.Office.Interop.Excel.Application
Dim xlWorkBook_new As Microsoft.Office.Interop.Excel.Workbook
Dim strOriginal As String
strOriginal = Server.MapPath(Request.ApplicationPath & "/Attachments/") & "abc.xls"
xlWorkBook_new = exlapp.Workbooks.Open(strOriginal)
The code hangs in the last line. It works fine in the development environment. i deployed in windows server 2000 ,where I get this issue. the browser goes half way and throws the below exception after some time
[Code]...
I have set the identity impersonate to true in web config. This should be mostly an access rights issue.I have even provided access rights for the "everyone " user in the excel file and as well for the interop component. Please post ur valuable comments.
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Aug 18, 2011
I'm trying to copy multiple excel source files into one excel file. My current code is working only for 3 source files..If more than 3 files are there, it doesn't copy the data but creates blank work sheet in the output excel file. Lets say I have a source folder with 5 excel files. Each workbook contains one worksheet with data. It copies upto 3 worksheets along with data into output excel file.
Lets say excel1 contains A as work sheet, excel2 contains B as work sheet ,excel3 contains C as work sheet ,excel4 contains D as work sheet ,excel5 contains E as work sheet .Now my output excel file should look like..OutputExcel with A, B, C, D, E along with respective data.But my current code is giving output as A,B,C worksheets along with respective data but its creating blank sheet1,sheet2 in place of D & E.
SSIS Script Task Vb.Net Code:
Public
Sub Main()
Dim filePath
As
String =
[code].....
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Jun 15, 2011
I am working with an application, which stores and manipulates data in Excel. have successfully imported the necessary Excel libraries viaImports Excel = Microsoft.Office.Interop.Excel
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May 16, 2010
In the following code why does the message box display behind the workbook,instead of on top of it? It does this related to the line, app.Visible = True. if this line is commented out the message box appears in front, but there is no workbook visible. I've used the message box in other places without a problem. Is there something fundamental here that I'm missiing?
[code]...
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May 10, 2010
I wrote code that creates an Excel workbook wit a single worksheet (see below). How can I update this to add multiple worksheets to the workbook?
''' <summary>
''' Create a new XLS Excel spreadsheet based on a passed CSV (comma separated values) file.
''' </summary>
[code].....
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Jun 5, 2011
I'm trying to create an excel 2003 workbook from my vb.net project I referenced the code from this website [URL]
However i'm getting error on this line "objSheets = objBook.Worksheets"
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
''Create the Excel object declaration
Dim objExcel As Excel.Application = Nothing
[CODE]...
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Jun 30, 2011
need to create an excel workbook with macros that clients accessingthe web app will download. Data to populate the workbooks comes from a database and I need macros to generate lookup tables in the workbooks. I cannot automate Excel to do this sincewill NOT beinstalled on the server. Which tool or component can I use for this task?
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Jun 5, 2011
to create excel workbook dynamically where data will be input and manipulated by user. i want graph as well to be created using the data i manipulated and entered.i want as many as work sheets to be added in workbook once it is created.
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Mar 25, 2011
My question centers upon the two approaches, (1) and (2), shown below, to declaring Excel workbooks in .Net.The two approaches interact differently with the lines "wkbk10 = app.wkbk10.open()" and later with
Range references to this workbook,like "rng1Stocks = CType(wkbk10.Sheets(1), Excel.Worksheet).Range("H5:H30")".
[code]....
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Mar 4, 2012
I think I am trying to do something simple. I am using this command:[URL]..Sometimes VB gets hung up opening the website. If this is the case, I want it to quit trying and move on to the next line of code.
For example, try to open the website in excel for 45 seconds. If still not open, skip and move to next line of code.
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Feb 10, 2012
I have the following function to read an excel spreadsheet and read a certain cell for a value and then I put it into my own List(of T). Everything works fine. However the one quirk I am running into is that as the "oExcel.Workbooks.Open(ExcelFileName)" executes, it does a "Windows Beep" sound.
[Code]...
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May 17, 2012
I tried the following code to retrieve data from an excel file,apply query and save the result of query to another excel file. Now there are two problems: One,I am getting the required data but some reduntant unwanted data too. Second,It only works if the excel file, from which the data is retrieved, is open.
Dim dr As OleDbDataReader
Dim i As Integer
Dim strLine As String = ""
[Code].....
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Aug 28, 2010
I am working on an application where I need to locate a range of cells within a worksheet. Since the actual location of the data will vary for each worksheet, I have come to the conclusion that I can put a string near the range that I am looking for (i.e. the text "*SUMMARY*") and since I will know the location of the data that I am looking for relative to the location of this text string, it should work.
I have made some progress but am having trouble getting the Find method of the range component to work. My code is below. This code finds each worksheet and shows me the name but I also need to to find the location of the cell with the string "*SUMMARY*" in it (if it exists).
Imports Microsoft.Office.Interop.Excel
Public Class Form1
Dim oExcelApp As New Microsoft.Office.Interop.Excel.Application
[code]....
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Feb 16, 2012
I wanted to know if i could use vb.net (visual studio) to create an application that seaches these worksheets for a key word then returns any rowns with this key word on?
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Feb 21, 2011
I have a little problem with a small application that uses an excel workbook, and i don't know what's the best way to handle this.In the past every computers here in the company had the same culture and the same office version/language.Now the company bought some new machines, that came with english version of the office (en-US). Now the program doesn't work, throwing the exception related with the assembly of the office.
I have two solutions to solve this, install the mui in all the computers, or the one that i want, adapt the application to work independent of the culture in the client machine.So how to accomplish this? Set the application culture to the same culture in the computer (i think this will not work, because the excel assembly that i ship with the application isn't the correct one for the client language it's the assembly of my machine language)... One copy for each language, once again it's not possible
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Nov 29, 2010
Content in Excel 2007(as the attachment):
C# Source:
private void ExcelDocViewer( string fileName )
02 {
03 try
[code]....
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Aug 19, 2010
I have a program that filters data and then outputs it to a tabg delimited file. I then use Excel Interop to open this file in Excel because directly outputting to a worksheet takes too long. So currently I am using this code:
AD.DF.WriteToFile(vbTab)
Dim WB As Workbook = ExcelApp.Workbooks.Open(AD.DF.DatafileInfo.WriteToFileLocation)
ExcelApp.Visible = True
The first line takes the filtered data and outputs to a tab delimited file. The second opens that same file in a new workbook in Excel. And obviously the third makes Excel visible. Here is my problem though: right now when this code is run there are two open workbooks. I already have an active workbook and I would just like to open this file to that workbook.
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Dec 5, 2009
I have successfully created a new excel with the code
[xlApp = New Excel.ApplicationClass]
and can transfer and manipulate data from my VB2008 form back and forth with the spreadsheet One time only each time I try and add additional data it wants to open a new workbook with the same name but cant seem to get it to just add the additional info.
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May 17, 2010
I would like to Import data from multiple sheets in a workbook. With this following code I get the this error: "The MS Jet database engine could not find the object 'Sheet1$' Make sure the object exists and that you spell its name and path name correctly." The name and path are correct, the error ocures in the highlighted statement. The sheet name is Sheet1
[code] Private Sub ExellFrm_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
Dim MyConnection As System.Data.OleDb.OleDbConnection
[Code]....
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Sep 16, 2010
I want to prit a specific excel worksheet out of a work book using vb.net if that is possible.
Below is my code it searchs and opens the workbook but it print the whole Worksheets but what I want to do is print the selected sheets (commented out below). Is there a way to set the printOut so that it prints only the selected sheets? [code]...
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Aug 8, 2010
I am finally switching from VB6 to VB Net and am rewriting a technical application that calculates the heat transfer performance of automotive radiators, heater cores, evaporators, condensers, etc.The user can calculate a heat exchanger and save the results to an Excel spreadsheet. After a series of calculations he can then plot curves of performance.
He can also click on a previous calculation in Excel and import it into the VB routine. The user may have a number of workbooks open when he does this.My problem is I need to open the Excel workbook that is the active workbook. I have been able to select the active worksheet but have been forced to specify the index of the workbook. I have not been able to get the workbook I want.. The code I used is the following,
Dim oExcel As Object = GetObject(, "Excel.Application")
Dim oBook As Object = oExcel.Workbooks(1)
Dim oSheet As Object = oBook.activesheet
How do I get the active workbook instead of Workbooks(1) with an index of 1?
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Jan 26, 2009
I need my program to be able to look through an excel workbook and return the data in a particular field.
My work book has multiple sheets relating to different products.
I want to search by the item code of the product then return the list price of the product.
I have googled it but can only find examples of returning specified rows of data not a single field!
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Feb 12, 2012
[URL]..a good way to create Excel files without using Ms Excel,but this is C# source code,I used [URL]..to convert from C# to VB.NET,but after conversion There are some strange errors :
Error21Too many characters in character literalc:BBBXLSExportDemoXLSExportDemoExcelDocument.vb1625XLSExportDemo
Error22Empty character literalc:BBBXLSExportDemoXLSExportDemoExcelDocument.vb1633XLSExportDemo
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Jun 21, 2010
What I wanted to do is close all opened workbooks. This code does the work IF there is at least one or more opened workbooks. My problem is IF there is NO opened workbook at all; It goes around unendlessly in the WHILE Loop. How do I not process the closing IF there is no any opened workbook at all? (NOTE: I found this code from somewhere else.)
[Code]...
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Mar 10, 2010
When I run the following code, I get the exception below:
''# NOTE: ExcelApp is a Private main form variable
Dim ReportBooks As Excel.Workbooks = ExcelApp.Workbooks
Dim ReportBook As Excel.Workbook = ReportBooks.Open(localFilename)
[code].....
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Sep 8, 2009
A customer has provided me with a spreadsheet file his team uses to provide quotes for a product. The spreadsheet has extensive data in underlying sheets and calls those sheets as part of the numerous formulas on the quote sheet.
I've been tasked with web-enabling this tool such that the quotes can be generated on the client's website, hosted in a shared environment, running ASP.net 3.5 webforms. The quote web form will be in a Restricted portion of the website controlled by ASP.net membership API.
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Oct 10, 2009
Create ASP.net 3.5 web form application derived from Excel Workbook
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Nov 20, 2009
While I have no problem to to program the output of two queries into 2 separate Excel workbooks and worksheets via
DoCmd.OutputTo acOutputQuery, "QueryA", acFormatXLS, "filenameQueryA", True
DoCmd.OutputTo acOutputQuery, "QueryB", acFormatXLS, "filenameQueryB", True
I have tried without success to find the right VBA commands within MS Access to create and save only one file with two worksheets, one for each query.
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