I am currently building a vb windows form application (.net 3.5 framework). For the next part of the application I want to be able to use an existing excel process which will have been checked out from sharepoint and manipulate the worksheet with my app.
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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.
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
[Code].....
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.
ProcessWindowStyle.Maximized for an existing (already started process)
View 6 RepliesI have a windows service that I have been writing in Vb.Net. As part of this service it calls a class that has a long running Process.I can execute commands to this process when I want to via the ServerCommands() class within the service, however I want to call these remotely. Possibly from a website or click once WPF application.
For this I have used a simple Tcp.Ip WCF example, and have verified it as working correctly.
This called OnStart()Private _serverCommands As ServerCommands
Protected Overrides Sub OnStart(ByVal args() As String)
Add code here to start your service. This method should set things
in motion so your service can do its work.
[Code]...
It appears that in debug _serverCommands is Nothing when it should be running.How might I go about ensuring any command I execute through WCF communicates with the running instance instead of creating a new ServerCommand() instance??I haven't tried WCF before, so I might be hitting a dead end... however I'm sure its possible.
The following code works fine but seems to leave instances of excel.exe running in the background. How do I go about closing out this sub properly?
Private Sub ReadExcel(ByVal childform As Fone_Builder_Delux.frmData, ByVal FileName As String)
' In progress
childform.sampleloaded = False
[code]....
I've got lots of XLSX files and I need to append a new row after the last one in the file. I'm using OpenXML and so far I know how to open/create spreadsheet, but my search for adding new rows to existing files returned nothing.
View 1 RepliesForgive me for being a twit! I am thought I was combining csv file with excel file in different worksheets. I have used the copy and paste functions to combine my csv file with excel file. But..the csv file seems to copy over the login data I have stored in Sheet 1. Can anyone spot why? I thought I'd finished....just a few more tweaks away.
[Code]...
Please see the code below:
Dim objExcel As New Excel.Application
Dim objWorkbook As Excel.Workbook
Dim objSheet As Excel.Worksheet
[code].....
I'm trying to figure out what would be the easier method for what I'm trying to accomplish. What I have is in, on the main form, a datagridview that is bound to an xls file. I then have another form that the user can import/paste data to another dgv. This content then needs to be appended to the end of the main form's dgv. Would it be easier to add it straight to the dgv and then save it to the excel file or save it to the excel file and reload the dgv? Or does it matter? I'm not exactly sure how to do either method but I figured I would start here.
View 1 RepliesI am writing a windows application that interacts with data stored in an Excel Spreadsheet. I merely want to change the text value of a cell that already has text written in it.
View 2 RepliesI am looking for an example to export the data from a dataset to an existing excel speadsheet in vb.net 2005?
View 6 RepliesVB2005. I have several DataSets that I create or grab from an external source. One example is
Dim sql As String = "SELECT TOP 30 * FROM myTable" & vbCrLf & _
"WHERE Area='YY' AND CarNum='734EP' " & _
"ORDER BY ProcDate ASC;"
Dim da As New OleDbDataAdapter(sql, myOLEDBconn)
'create a dataset and fill it with the returned data.
Dim ds As New DataSet
da.Fill(ds, "MyData")
Once I have these DataSets I then have to pump them into a specific worksheet in an existing Excel2007 workbook. The connection and interaction with Excel and the workbook/worksheet is already established and that works. But I am stuck in exporting the DataSets
into the specific worksheet.
Note that I have already scoured the web and MS Community site and all code that I have found so far iterates through each and every row and column of the DataSet and then adds that to the worksheet in a cell by cell manner. This is fine and in testing that works. But there has got to be a better way to do this. For even a moderate sized DataSet the exporting just takes a long time. 25 records with 15 columns takes about 10 to 15 seconds.
I've also been experimenting with some scratch code I found that converts the DataSet to an ADODB Recordset and then uses the xlwksht.Cells.CopyFromRecordset function to export it in one fell swoop. I haven't got this one to work just right but it seems in the end it also does an iteration through each and every record and field to convert to the ADODB recordset.
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.
how to import the data in an excel 2007 file located on the local computer or on the network into an EXISTING Access 2007 table? The excel file contains a single sheet.
View 7 Replieshow to insert a row into an excel file via vb.net?
I am familiar on how to do this inside the spreadsheet using vba - but not certain how to accomplish this within vb.Net.
the following is a working button to load excel data into a listbox. When I first wrote it I just used a loop to pull items 1-10 to do testing. Then sufficiently forgot about it and remembered just now. So in short here's the button:
[Code]...
I want to modify the third column of an existing excel file. The problem with below code is a new file is prduced with the new values in Column C and erases all other values in the orginal file. I want to update the orginal file with the new values.
Public oExcel As Excel.Application
Public oBook As Excel.Workbook
Public oSheet As Excel.Worksheet
[Code]....
I'm fairly new to coding in Visual Basic, and I'm working on a project where I have to allow users to write data to an existing Excel worksheet (by entering the data into a form created in Visual Basic.NET). I've created a form that allows users to enter data such as the following:
[Code]...
I'm working on a project where I have to allow users to write data to an existing Excel worksheet (by entering the data into a form created in Visual Basic.NET). I've created a form that allows users to enter data such as the following:
Name (First, Last)
Mailing Address
Email Address
Gender
Age
...and so on. I've programmed the data to be sent to the Excel file upon clicking on the Submit button in the form itself. I've also created the Excel file and placed it on my C: drive, but the problem I'm having is trying to send the data from the VB form to the Excel file itself. Can someone please show me some sample code or point me in the right direction as to how to get the submitted information from the form to save into the Excel file, please?
I'm trying to get the information to show up in rows and columns in Excel like the following below (the dashes are just to show that the information should be in rows and columns):
Name--------------------------Mailing Address-------Email Address-------Gender-------Age
John Doe---------------------2300 Jackson Street-------- xxx@xxxx.com-------Male---------17
This may be a lengthy explaination, but I am hoping to make myself clear.I have an existing Excel file that is created using the following code:
Dim warnings() As Microsoft.Reporting.WinForms.Warning = Nothing
Dim streamids() As String = Nothing
Dim mimeType As String = Nothing
[code].....
I've programmed a vb.net application. This is a matching applcation generates 3 lisboxes. I have written these to a csv files. [code]...
View 3 RepliesI 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]...
View 1 Repliesi'm trying to import a excel sheet to a access table but when I run.. it says: "The Table 'Telemoveis' already exists" and I don't want to change the name I just want to update the existing table ("Telemoveis") in the access
HERE IS MY CODE:
Private Sub ImportarToolStripMenuItem_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles ImportarToolStripMenuItem.Click
If OpenFileDialog1.ShowDialog = Windows.Forms.DialogResult.OK Then
[Code].....
I have this piece of code which picks the data in an excel file. At the moment i have the data into the dt table. how do i write the data in dt to FECHO_UNICRE table at the UTLT.accdb database? I want to fill the table just after deleting the existing records.
Octavio
Private Sub Unicre_Calculos_Load(sender As System.Object, e As System.EventArgs) Handles MyBase.Load
'Try
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I want to know how to open an existing Excel Spreadsheet into a MemoryStream to that I can write to the Response object.
Dim ms As MemoryStream = CreateBasicWorkbook(True)
Dim FileName = "\Ihe-webprod1tvinjurytrackingdocuments$ExcelSpreadsheetsHours.xlsx"
I need the code to get File the xlsx file to a memory string
Response.ClearHeaders()
Response.ClearContent()
Response.Clear()
[code]....
I have questions on this [FAQ's: OD] How do I open an existing Excel Workbook? I have playing around with the code little. Trying to mod the code to display the selected path and File name in the textbox I have on a form. I can to get it to work right
View 1 RepliesHow do I start in visual basic 2008 express, a existing Excel application? e.x test.
View 2 RepliesI need to embed existing excel sheet(1) to my form1.I try this code but this is not what i want.
Private Sub btn_write_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btn_write.Click
Dim oExcel As Excel.ApplicationClass = Nothing
Dim oBook As Excel.WorkbookClass = Nothing
[code]....
here is a copy of my current code. Am trying to open an existing Excel spreadsheet then retrieve the old balance data refigure the new balance and store new data into the spreadsheet. Am I on the right tracK, or way out in left field?
Private
oWB.SaveAs(
"Checkbook.xlsx") Nothing
oWB.Close()
[Code].....
