Read An Excel File - Loop Through Cells To Get Values?
Jul 25, 2008
I'm using VB.Net's Excel component to read Excel file, but the performance is totally slow, since it has to loop through cells to get values. Reading a file containing one sheet with 1162 rows and 105 columns (which is small size compared to my general requirement) already costs more than 5 minutes.1. I want to ask if any of you have suggestion on reading such an Excel file with better performance, except OleDB, cuz most compies here have vesion problem?2. Is it normal that it tooks a long time for Excel component to read Excel file, or is it that I implement the code in a wrong way?
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Apr 28, 2009
[code]i need to read data from specific cells and assign them to other cells.
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Jan 22, 2009
I wanna read all cells of all sheets/pages in my excel file and just show the text content of each cell. [code]
1. How can I read cells inside the While?
2. My select command only selects Sheet1, how can I select ALL sheets?
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Jan 22, 2009
I wanna read all cells of all sheets/pages in my excel file and just show the text content of each cell.I have written my code but have 2 problems:
Dim ExcelConnection As New OleDbConnection("Provider=Microsoft.Jet.OLEDB.4.0;Data Source=C:Excel.xls;Extended Properties=Excel 8.0;") ExcelConnection.Open() Dim MyCommands As New OleDbCommand("SELECT * FROM [Sheet1$]", ExcelConnection)
[code]....
1. How can I read cells inside the While?
2. My select command only selects Sheet1, how can I select ALL sheets?
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Sep 6, 2011
I am new to VB.NET and I am trying to read a line of data from a .csv file. For some reason the line of code below is returning "System.__ComObject", why? I verified that the cell contains "4/8/2011 9:20".
Me.cv_wks.Cells(i, "G").ToString
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Mar 18, 2012
Is there a way to read excel file cells from vb.net including the font size, font color, etc
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Sep 25, 2009
I am trying to read data with a test routine from a fairly simple 3rd party Excel file. The file has three sheets and was created by Open Office 3.x as an 'Excel 97/2000/XP .xls' file. The later, still to be programmed, application must later run on machines with Windows XP Professional using the 2.0 .net framework and no Office package installed. The content of the file does not need to be modified by the later application. For some reason, numeric values are not read correctly. They "convert" to DBNull. I've searched around a bit but not found a 'simple' solution for solving this problem. Adding 'IMEX=1' or 'HDR=Yes;IMEX=1' to the connection string results in an error 'Installierbares ISAM nicht gefunden' (installable ISAM not found).
Based on various examples I've found, I've written the following test code:
Option Strict On
Option Explicit On
Imports System.Data
Imports System.Data.OleDb
Public Class Form1
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
[Code] .....
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Aug 25, 2011
I have this code the exports datagridview from vb.net to ms excel, There should be a total at the end of the table in the ms excel after exporting it but my problem is I can't merge the cells for "Total".
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Dec 20, 2009
I need to be able to take numbers from multiple textboxes and input them into certain cells in Excel. Also need to do the opposite (Read numbers from Excel and put them into textboxes.)
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Apr 27, 2010
Need to get code to read all cells from row2 from excel worksheet1 and move into 2 dimensional array (rownum, colnum). I looked at forum for hours and its SOOO more complex that I need that I'm sure my confidence as a vbs person thinking this .net vba is simple
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Oct 5, 2009
I want the people using my program to choose their own cell to read. I will have 2 textboxes (txtRow and txtColumn). They will have to click "read" to read from excel (but I will not open MS excel) and the answer will show in a message box. This is what I have done..
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnCheck.Click
Dim conn As New OleDbConnection("Data Source= D:LeeABC.xls ;Provider=Microsoft.ACE.OLEDB.12.0; Extended Properties=Excel 12.0;")
Dim da As New OleDbDataAdapter("Select * from [Sheet1$]", conn)
Dim dt As New DataTable
Dim Row1 As Single
Dim Column1 As Single
txtRow.Text = Row1
txtColumn.Text = Column1
da.Fill(dt)
MsgBox(mycell)
End Sub
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Aug 25, 2009
I want to retrieve the value from example Cell C4 and dim it as String and then retrieve Cell D8 and dim as string etc.
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Sep 17, 2011
I programmed a tool to help making invoices.It is fully programmed in Visual basic.
Can i put the items that i read in in inputboxes in cells in an excel page?
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Mar 1, 2010
I am trying to read off some cells from an Excel File. I can't figure it out. Here is my code:
Public
Class TOC
Dim ExcelObj As New Microsoft.Office.Interop.Excel.Application
[Code]....
After making WorkSheetObj I dont know what to do.. I am trying to dynamically change the Texts of Four buttons. The text values are to be to read off of Excel cells.
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Nov 6, 2009
I'm trying to write an import function for getting data out of an excel file. How I currently do it is as follows:
Private Sub ReadExcel(ByVal childform As PhoneDiag.frmData, ByVal FileName As String)
Dim xlApp As Excel.Application
Dim xlWorkBook As Excel.Workbook[code]....
From what I can gather, it more than likely comes down to this line:
Dim Obj = CType(therange.Cells(rCnt, cCnt), Excel.Range)
All I need is the text from the cells, not to create an object for each cell (and then not send them to garbage collection).Is there an easier way of just getting the text? Ideally, if I can get a method for getting the text values of the cell, I'd like to get the multiple rowArray()'s added to a master array and update the program's values later.
EDIT:I also realize that I have two options if I were to create a master array, say mArr, to hold all the data.Would it be better performance-wise to have mArr to be large and the sub arrays small, or mArr to be small and the sub arrays to hold more of the information?I ask because the files that will be imported will have more rows than columns, so I was wondering if there was any "set" way of doing it.
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Jul 5, 2009
My main goal is to have an excel spreadsheet that automatically plots the overall success of my stock portfolio over time (% change over time). I've been able to incorporate stock data into my spreadsheet by linking it to the web, but the trouble is the spreadsheet will keep no history of what the previous stock values were, so I can't graph how things change over time. This sounds like it might be too complicated to be built in to excel, so I was wondering if anyone knew how to program this in Visual Basic. Maybe something like this.... If refresh then new cell plus new time stamp. Another possibility would be to have a whole bunch of cells that refresh only once but at longer and longer intervals, e.g.,
[Code]...
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Dec 22, 2009
I have 12 textboxes named TextBox1 to TextBox12. How can I loop through these textboxes to assign and read the values? I.e.:
Dim strTextboxName As String
For i As Integer = 1 To 12
strTextboxName = "TextBox" & i
TextBox{i}.Text = ...... ?????
Next
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May 6, 2011
i am trying to build an application where a specified number of cells are spoken from an excel file. what i want is something similar to what happens in excel, once u click play one cell after the other is selected and spoken and it automatically moves forward to the next, speaks and so on... but if i use voicecombo/SAPI.spvoice the UI freezes! any ideas?
[Code]...
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Jun 9, 2011
I'm trying to populate a ComboBox with all column headers I have in my Excel -file...
Dim Polku = fdlg.FileName
Dim XL_App As New Excel.Application
Dim XL_WB As Excel.Workbook = XL_App.Workbooks.Open(Polku)
Dim XL_WS1 As Excel.Worksheet = XL_WB.Worksheets(1)
with ComboBox1
[Code] .....
All I get are 10 values that are:
System.__ComObject
Even though I should get in the dropdown list:
No:
Title
Dept.
Item
Spec.
Size.
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Mar 23, 2009
I have a DEM file(Digital Elevattion Model File) and I am trying to open the file,where we have Latitude and Longitude values inside the DEM file.And, Now I have opened the file using Filestream and Read the file using BinaryReader.But, I am having a trobule in getting the values of Latitude and Longitude.I am getting Byte values randomly as 1,202,31,271 etc.But, we dont have latitude and longitude values more than 180,and also I am not getting 16 bit UInt values.For example, the values should be like Latitude 20.00416666666667 and Longitude 39.99583333333333.So,read the correct Byte values of the DEM file.The code I have used till now is:
Dim fs As FileStream = New FileStream("C:UsersadminDesktopHeader and DEM fileE020N40.DEM", FileMode.Open, FileAccess.Read)
Dim rd As New BinaryReader(fs)
Dim convertDB As UInt16
For i = 0 To rd.BaseStream.Length
[code]....
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Mar 3, 2010
I have to do an application using VB.Net .The application must be able to capture values from ms word data table and map them to ms excel sheet. For your information, i have over 6000 files ms word document, each of them contains 4 data tables using the same format .Then i have this code for read from data table 1 in document 1:
Dim
wb As
Excel.Workbook<br/>
[Code].....
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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
Try
Dim OledbConnectionString As String = String.Empty
[code]....
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Feb 27, 2012
I tried to read excel file using the method i found here [URL] But i get an error on ADODB.Connection saying "Type 'ADODB.Connection' is not defined" in the following code:
Code:
Private Function GetExcelConnection(ByVal Path As String, _
Optional ByVal Headers As Boolean = True) As Connection
Dim strConn As String
[Code]....
Its was used in VB6... do i need to do something special in Visual Studio 2010?
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Jun 11, 2010
I am writing a VB.NET program and I'm trying to accomplish the following:
Read and loop through a text file line by line
Show the event of the loop on a textbox or label until a button is pressed
The loop will then stop on any number that happened to be at the loop event and when a button is pressed again the loop will continue.
Code
Imports System.IO
Public Class Form1
'Dim nFileNum As Integer = FreeFile() ' Get a free file number
Dim strFileName As String = "C:scb.txt"
[Code] .....
I'm able to read the text file but my label will only loop if I hit the start button. It goes to the next line, but I want it to continue to loop through the entire file until I hit a button telling it to stop.
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Aug 9, 2011
In a loop, I need to read a list of URLs from a text file, download the web page, and search for a bit of text using a regex. I used the following code, which triggers the error "WebClient does not support concurrent I/O operations.":
[Code]...
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Aug 9, 2011
In a loop, I need to read a list of URLs from a text file, download the web page, and search for a bit of text using a regex.
I used the following code, with DownloadStringAsync() to avoid freezing the UI, but it triggers the error "WebClient does not support concurrent I/O operations.":
Private Sub AlertStringDownloaded(ByVal sender As Object, ByVal e As DownloadStringCompletedEventArgs)
If e.Cancelled = False AndAlso e.Error Is Nothing Then
[Code].....
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Feb 4, 2011
i have this code
[Code]...
I want If A.Text = (detline(0)) the program show a msgbox (OK this) and after the msgbox to cl;ose the file and exit from soubroutine When the pointer reach the FileClose(ReadFile) i receive in Catch When an Err.Number 13 WHY??
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Jan 20, 2012
I have a folder that contains about 100 txt files with information in each file.I'm trying to figure out how to loop through each file in the folder, and add the text to a string.I've pulled this off MSDN's site, but it doesn't seem to read "each" file but just one.
Dim path As String = "c: empMyTest.txt"
' This text is added only once to the file.
If File.Exists(path) = False Then
[code].....
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Mar 6, 2012
I have excel 2007 installed on my laptop. I have vb.net 2010. I have tried a dozen different pieces of same code and I cannot read from an excel file...
Imports Microsoft.Office.Interop.Excel
Public Class Form1
Private Sub Form1_Load( _
ByVal sender As System.Object, _
ByVal e As System.EventArgs) _
Handles MyBase.Load
[Code] .....
Warning1Namespace or type specified in the Imports 'Microsoft.Office.Interop.Excel' 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.C:UsersksimonsAppDataLocalTemporary ProjectsWindowsApplication3Form1.vb19WindowsApplication3
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May 1, 2009
I am trying to read from an excel file. so far this is what i have:
Public Class testclass
Private wrkbk As Excel.Workbook
Private sht As Excel.Sheets
[code]....
The debugger gets to the "sht = wrkbk.worksheets(1)" line then says its has error: Member not found. (Exception from HRESULT: 0x80020003 (DISP_E_MEMBERNOTFOUND))
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