Excel VBA Code Waits Indefinitely When Excel Window Is Not Active

Sep 7, 2010

I have one excel sheet which has ontime event of 5 mins to run some code.This code works fine when in debugging mode. But if I lock my PC or minimize excel windows and  start working something else, this code just pauses at beginning and as soon as I activate excel window, this code runs.this code involves opening and closing of one userform and i think userform is culprit.


Excel Window Of A VSTO Project Is Active/in Focus?

Apr 27, 2009

Anyone know of a way to see if the Excel window of a VSTO project is active/in focus?

I'm looking for an equivalent of System.Windows.Window.IsActive.

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Nov 9, 2010

I can do this using VBA, but I want to be able to create the code using a compiled VB programme, which can then be opened in Excel.

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Aug 16, 2010

I am exporting data from vb.net to excel and it is dropping the leading zero when its displayed on excel. How can I avoid the dropping of leading zero? I read the solution of adding a single quote but it makes my excel sheet column ugly. Also users will complain if they see a single quote on zip code field.vb.net code

Response.AddHeader("content-disposition", attachment)
Response.ContentType = "application/vnd.ms-excel"
Response.Charset = ""

the stored procedure outputs XML and it is transformed by XSLT before it is displayed on EXCEL

<xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
<xsl:template match="/">


adding a single quote or manipulating excel sheet with column formatter (general/numbers ) etc. I don't want user to make any changes on excel to get the display properly when the excel is displayed from web page it should be all set with proper formatting. also we have no control over client excel software?

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Office Automation :: Code Hangs When An Excel File Is Opened To A Excel Workbook Object?

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


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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VS 2008 : Use Code To Read Excel File With Excel Installed?

Feb 7, 2012

I am uploading an excel file to my app and want to read it. Do I need to have excel loaded to read this?I am getting an error of Object reference not set to an instance of an object.

Public Function GetExcelData(ByVal ExcelFilePath As String) As DataTable
Dim OledbConnectionString As String = String.Empty


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Hook Excel - The Process Excel.exe Doesn't Finish After Close Excel

Jul 20, 2010

I need to access the current instance of MS Excel. To do that, I wrote the following code:

Imports Excel = Microsoft.Office.Interop.Excel
Imports System.Diagnostics
Private _ExcelApp As Excel.Application


The code runs nice, but it has a problem: After the user close the Excel application (click button X - note: no other instance of Excel exists), if you open the Windows's task manager, its possible to see the process Excel.exe.

If I open and close the Excel application, there is no process Excel.exe, but if I run my code with the Excel application openned, after the user close the Excel application, the process Excel.exe isn't finished.

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Set An Active Printer On Excel?

Jun 29, 2009

I receive an error when try to assign active printer to excel[code]...

But i cannot hardcode this way because when i deploy on my test machine the value is change to My PDF Printer on Ne02

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Excel - Open A File In An Active Workbook?

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:

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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VS 2010 Open Active Excel Workbook?

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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Cannot Close Excel - Process Active In Task Manager

Nov 1, 2010

In the code below, I open excel file, when I try to enter some values into excel cells, and close it afterwards. For some reasons excel process is still active in task manager. I am releasing objects, quiting application like for other excel files in my program, but in this specific example can't do this. The code below is written in Visual Studio 2010, windows 7.

Imports Microsoft.Office.Interop
Public Class Form1
Public MainPath As String = System.IO.Directory.GetCurrentDirectory()
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
[Code] .....

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Microsoft.Office.Interop Get Excel Active Row And Column?

May 16, 2012

I am in need to get Excel Sheet name and current Column and Row,  I have theActiveSheet.Name working but unsure how to get Column and Row

Private Sub ButtonTab_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles ButtonTab.Click
Dim MyExcel As New Excel.Application


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.net Microsoft.Office.Interop.Excel Active Cell + 1 Column?

May 25, 2012

I have code that will plus Row but need help with pluse column.Full code snippets:

Imports Microsoft.Office.Interop
Public Class Form1
Private Sub ButtonTab_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles ButtonTab.Click
Dim MyExcel As New Excel.Application


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Nov 18, 2011

I have a dataset that I would like to export to excel format in a new pop up window. Can someone assist me with writing a dataset to excel format without having to save it to the user's pc?

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Minimize Excel (or Keep The Console Window On Top)?

May 15, 2012

I am making a console application that basically just takes in rainfall over the year, then exports the data into an Excel template and saves it.  I've accomplished all this but cannot for the life of me get the window to minimize.  I can change the size but everything I've tride doesn't work. 

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Jun 24, 2009

can I use Excel APi (Interop.Excel) without installing MS Excel.

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Apr 22, 2011

I want to export data table data into excel file.My code is works perfectly. but when excel is generated its automatically open the file, but i want to display Open & save dialog box at export time.

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Detect The Print Preview Window Of Excel 2003?

Aug 5, 2010

I need to be able to test if the current view is print preview in Excel 2003.

Is there something in the excel object model to simply access this property? (Like the application.printpreview in the Word object model...).

PS: Long story short, I'm developing a vsto addin with keyboard short-cuts to my custom functions, and I need to disable this shortcuts when print preview is on.

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Office Automation :: Put The Excel Window On Top Above The Main Form?

Aug 17, 2011

i made an application in VB2010 where the application should be always on top above one specific window. Anyway i set the property of the main form to "topmost = true". The application is also writing some data to excel which is not a problem but the excel workbook is behind the main form which is on top. Is there any way to put the excel window on top above the main form?

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Another OPTIMIZING Macro Vba Code For Excel 2007 - The Code Is A Sort Of Transposer For Data

Sep 9, 2011

this code was not done by me originally and there are some thigns here i dont quite understand i have altered it a bit from my coworkers code to suit my data and it works. but too slow. and when i have 4000+kb excel files it might freeze altogether. ( I have checked tho that when and after this transposer runs it will still be within the excel row limit, i had done calculations before and made a macro to automatically split excel files based on number of columns and rows to make sure this is so ). This code seems to start out fast then goes slower the longer it runs. at least this is what it seems liek to me.


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Convert Excel 2007 Macro Code To Correct VB 2008 Code?

May 26, 2010

i recorded the following macro in excel 2007:


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Office Auto-mation :: Annoying Window Pops Up From Hidden Excel?

Oct 20, 2010

I have an application that opens and saves spreadsheet via interop.At start up I set

_excelApp.Visible = false;
_excelApp.DisplayAlerts = false;


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C# - Excel Interop Quitting The Excel Application Instance Makes Tests Fail?

Feb 23, 2011

I want to encapsulate the use of Excel Interop to make it easier to use somehow in a reuseable library.So far, I have written some tests that work good altogether, except that between each test, I force Excel to quite so that it does have handle on the test file no more in order to be able to delete.Once I quit the application instance between after each of my tests, Excel seems to be no longer responding, causing Windows to display "Excel has stopped working and is looking for a solution"

message. This message lasts a few seconds, meanwhile Excel is closing, causing the hang on the file to occur and my tests to throw an exception like "Cannot access file because it is being used by another process..."


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May 12, 2009

I am using VS .net 2003 and developing a program that calls Excel.  The development computer only has Excel 2003, and the target machine only has Excel 2007. Would it be possible to install Excel 12 Object Library in the development computer without installing Excel 2007?

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Office Automation :: Excel File - Set A Reference To The Microsoft Excel 12.0 Object Library

Oct 6, 2009

I'm trying to upgrade a VB6 app to VB 2008. I have read the article in the tutors corner about automating Excel from VB but I cannot get it to work. Heres what I have done:

1) set a reference to the Microsoft Excel 12.0 Object Library

2) Added "Imports Excel = Microsoft.Office.Interop.Excel" to the top of the module

3) in a routine I have added: Dim X As New Excel.Application Here's where I get an error: Error 75 'Application' is ambiguous in the namespace 'Microsoft.Office.Interop.Excel'.

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VS 2008 VBNET2008 EXCEL 2003 - OLEDB To Retrieve EXCEL Data To DataReader?

Jan 22, 2011

I am trying to retrieve the data from EXCEL 2003 spreadsheet from row 8 onwards because from Row 1 to Row 7 the row is merged columns from A1 to K1, A2 to K2, A3 to K3, A4 to K4, A5 to K5, A6 to K6, A7 to K7.

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Excel Linked - Populate A Number Of Combo Boxes From An Excel Document

Jan 19, 2009

i Have this code which populates a number of combo boxes from an excel document, the problem is that it only populates the 1st three lines, does anyone know why this is??


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Jan 10, 2012

I'm trying to export a datagridview to Excel and open the Excel spreadsheet (not SAVE the worksheet).

Public Sub ExcelRpt(ByVal DgvName As GridView, ByVal url As String)
Dim xlApp As Microsoft.Office.Interop.Excel.Application
Dim xlWorkBook As Microsoft.Office.Interop.Excel.Workbook
Dim xlWorkSheet As Microsoft.Office.Interop.Excel.Worksheet


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Feb 24, 2012

I am writing a program that loops through all of the sheets in an Excel workbook and saves each sheet as its own workbook. It turned out to be a bit trickier than I expected, since the Sheet.Copy method creates a strange object (see here for the MSDN discussion that I believe is relevant: [URL]. Anyway, I found a Stack Overflow post [URL] that got me to where I am, which is essentially complete, outside of one hanging EXCEL.EXE process that is left after the program completes, which I believe is a result of the sheet.copy method creating a new workbook (potentially a new application as well?). The other thing I run into, which I believe is related to this, is that even though I have my application set to visibility off, when I run the program, excel still opens up and is visible going through the steps.

Here is my code:

Imports System.Data
Imports System.IO
Imports Microsoft.Office.Interop


Now I think the problem comes from the end of the loop, where I try to close the export file and the new worksheet it creates:

'close excel and release com objects
exportsheet = Nothing
xlApp1.Workbooks(fileNames(counter - 1)).Close(False)

I can't figure out what to do to release the `ComObject` for the new worksheet that is created. I have been trying all sorts of things, but it always throws a COM error when I do it and if I try to define it as nothing (like I do with exportsheet) is says that it is read only by default, so I can't do it. It seems like it should be something as simple as: System.Runtime.InteropServices.Marshal.ReleaseComObject(xlApp1.Workboo ks(fileNames(counter - 1))) But that is not the case. I have tried a few variants of this and I am thinking it has to do with the MSDN link above, but I can't quite sort out what to do. So the code works for my purposes, outside of leaving one EXCEL.EXE after it is done. As far as a test file, I am just using an Excel file with 3 sheets and I put some information on each and change the sheet name, so it is easy to see if it is working or not.

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Nov 22, 2011

I have been doing a lot of reading on this topic and most folks seem to agree that having Excel is required to use the COM Interop libraries. However they are never specific as to where that should be installed. Does it need to be installed on the machine I am developing on or does it need to be on every machine that I deploy to?

Edit: I should mention that this is desktop development/deployment targeted for all Windows machines.

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Aug 4, 2011

I have an asp:table which I want to exported to excel. One of my fields are alpha numeric and when exported to excel the leading 0s are stripped off. After going through this thread: Validation (CSS 2.0): 'mso-number-format' is not a known CSS property name I would like to use the css method "mso-number-format:@;.But the css is not exported to excel. I just tried to test it with simpler css things like bold font etc but its not getting carried over. I can see that if I surround my asp:Label with tags this change gets carried over to the excel but not the css bold . Other solutions in other thread does not work for me as ="00111" shows up as desired in excel but in the web form it shows up as ="00111" which is not what i want.

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Dec 19, 2011

I have to provide an Excel file as an output. I have to color some of lines and make them bold.The input is based on a dynamic list (in memory) and it also could be based on CSV file that I'm already provide today (based on the same dynamic list).I'm wondering what would be the most efficient way (in terms of performance) in order to provide the colored Excel output?Should I export directly from dynamic list into Excel - or - Should I export from CSV into Excel ?

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May 11, 2012

I have a VB.Net App that on ButtonRun_Click open Excel to get the "tab" and "column" then another buton that past content from textboxes.  I get a "COMException was Unhandled"  If I reopen excel it's in use.  

Private Sub ButtonRun_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles ButtonRun.Click
Dim MyExcel As New Excel.Application


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Aug 6, 2010

I am trying to create double and number format cells in excel using NPOI library. I used code like Dim cell As HSSFCell = row.CreateCell(j) cell.SetCellValue(Double.Parse(dr(col).ToString)) In excel numbers are aligning right but when I check format it is showing in "General" then I changed my code to like below


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Apr 1, 2009

I have read some of the other posts on this and seem to be a little different than my situation. Trying to print out some reports into an excel document on the clients machine - of course it works fine on my local (heard that before right). I went in and set my references Ms.Office.Core and Ms.Office.Interop.Excel to 'Copy Local' = True so the .dll are in the servers bin folder.


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Mar 5, 2012

I have a project that has a need to display a Excel file in second window, but because other controls are needed, simply launching excel is not sufficient. Right now I do not know if the target machines have excel installed but I know with certainty that if they do it would be 2010, is there any method or library that allows you frame your own form around an excel window?

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Feb 29, 2012

I'm trying to upgrade an Excel VBA workbook to a VSTO Excel Add-in in VB.NET using VS 2010. In the original (i.e.- VBA) version I have a modeless UserForm (called frmMain) that floats on top and is visible at all times while the user is still within the Excel application, but is not visible if the user moves to another window outside of Excel.

For example, within Excel the user can click on any worksheet tab, select any cell, etc. and the UserForm is still visible. This is exactly how I'd like it. The problem is, that in the new VSTO add-in, I can not get the Windows form to mimic this same behavior. I use frmMain.Show() to show the form as a modeless form, but the moment the user clicks an Excel worksheet (i.e.- activates a worksheet) the form becomes hidden behind the worksheet.


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Exporting To Excel - Get Excel To Return Down A Row And Display The Next Product Within The List Box?

Apr 16, 2011

I am building an ordering system for my job.  The idea is that the customer will put in a stage name for an item.  That stage name is then interpreted by the program.The product id and the amount the customer wants to order is placed in a list box on the form.  There are a couple of buttons, ADD, REMOVE, CLEAR, and EXPORT.  The user input is handled by input boxes.  When the user pushes the EXPORT button, excel should open and list out the interpreted product codes with the corresponding amount to order. I can get excel to open, but I can not get excel to display more than one line.  It will display the first product, but then it comes up with an unhandled exception.I can not figure out how to get excel to return down a row and display the next product within the list box.

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Jul 13, 2010

I have an application the contains several excel files bundled with it. I'm not opening the files and processing them within my application. These files contain a data-connection to reload all of the pivot-tables within each excel file. I have a 'link' on my form, that when clicked, it determines which file to open and calls a sub using filename and executing Process.Start(filename) for any excel file I want to open. I have no problems opening any one of the files and then exiting excel.

The problem is when I 'close' a file, but don't exit Excel; then try to open another file(clicking link on form)... it creates a new instance of Excel.

I know from experimenting that the fileopendialog form will 'reuse' an existing Excel instance, IF it does not already have a file open.

How can I do the same thing without using the fileopendialog?

I don't want the end-user to have access to the folders where these files live. That's why I have multiple 'links' on my form, one for each xls that already exists. I just want them to be able to click on a link and the xls file opens AND if they choose to merely 'close' a file and not exit... Don't create a new instance of Excel, but re-use the existing one.

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