.net - NULL Values Reading From Excel File?
Mar 4, 2010i am not getting the integer values in dataset while reading from an excel files the field which is integer will be showing as NULL.
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Reading Values From An Excel File?
Jan 22, 2010I want to get a value from 12 excel sheet. is there any way that i get the values without opening the excel sheet? I am using vb.net. if there is a way to read values without opening the excel file.
View 3 RepliesReading Values In Cells From Excel .csv File?
Sep 6, 2011I 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
Reading Excel In .NET - Some Columns Are Read In As Null?
Sep 27, 2009Reading Excel in .NET - some columns are read in as null
View 10 RepliesVS 2010 Reading Excel Returns Some Rows As Null
Oct 25, 2011I have a vb.net app that I can read a .xls file into a dataset or loop through as oledbdatareader and it gives the same result.Some of the rows have all nulls when I loop through them but if I open the same file in Microsoft Excel I can see that row fine.[code]From the info above the first two SKU values would come through fine but when I get to the 3rd row it would show a null.Is it possible that it kind of inherits the first rows type and since the 3rd row isn't all numeric if nulls it? [code]
View 1 RepliesExcel Values Become Null ?
Oct 15, 2009I'm trying to import my xls files to sql server, but i saw some values become null even though data in excel values are exist.
below is my connection string :
Code:
Dim cnstr As String = "Provider=Microsoft.Jet.OLEDB.4.0;" & _
"Data Source=" & txtfName.Text & ";" & _
"Extended Properties =""Excel 8.0;HDR=YES;IMEX=1"""[code].....
This error occurs while i'm importing the alphanumeric values into text, but previous values are numeric (but string datatyped).
DB/Reporting :: Connecting To Excel - Null Values?
Oct 22, 2008I created a connection string for an excel file. I prefer this method as opposed to creating "Excel" objects since it is not restricted to a specific version of Excel.When I connect to the excel file, I step past the first few rows since they have data that is not needed. When I reach the first field that contains a date, then I begin my data import. However, at that point (A8), it shows the cell in the "A" column as having a Null value even though there is indeed a value in the cell. Columns "B" and "C" are fine.
View 1 RepliesVS 2010 Reading Excel Does Not Return Any Values In VB Application?
Apr 13, 2012I am developing a vb.net app that should read cell values from excel. However, it is not returning any results and I thought that it would be really simple. I have imported all the references viz. Microsoft Excel 12.0 Object Library.
Following is the function in my class file which should read the excel file
Dim mobjApp As Excel.Application
Dim mobjWB As Excel.Workbook
Dim mobjSheet As Excel.Worksheet
[Code].....
Ignore Null Characters (chr(0)) Upon Reading A File?
Aug 13, 2010So I want my program to read a file, but sadly there are null characters in the text file. The program searches for strings and I want it, when searching, to ignore all of the null values and just the actual characters. Is this possible?
View 4 RepliesFileGet Stops Reading Binary File At First Null (0) Byte?
Dec 18, 2011I must search a binary string for a pattern. This worked fine in VB6 using Get to read a file into a string and using InStr to search for the pattern. The conversion from VB6 to VB.NET changed Get to FileGet and warned of new behavior, but I don't see anything in the FileGet documentation about not being able to read 0 value bytes.
I don't mind at all changing to a new method, but ultimately I must get the data into a string rather than an array.
[Code]...
Reading Hex Values From A File?
Nov 7, 2010I have a problem reading a file with hex values.
The values have this format: (2C 0A 0B 45 32 38)
I�ve tried two different ways to open the file. The first one, is storing in a variable of type string,
Dim srTrad As New System.IO.StreamReader(fichToOpen, System.Text.Encoding.ASCII, True)
sLine = srTrad.ReadLine()
so what I get is �2C0A0B453238�. Then I try to put them in pairs and reading as a HEX value, but I can�t. The only thing I get is the hex value of �2�, �C�, and so on. This is not what I�m looking for.
The second way is storing the values in a variable of type Byte:
Dim srByte As New IO.FileStream(fichToOpen, FileMode.Open, FileAccess.Read)
Dim br As New IO.BinaryReader(srByte)
Dim data As Byte() = br.ReadBytes(CInt(numBytes))
The result here, is pretty the same as before. For the pair �0A� what I get is either (30,41) or (48,65) (hex values or Dec). What I need isn�t to convert a char to its Hex value (I saw several examples for this on this forum). What I need is to know that 0A means 10 (0A is a hex value itself)
Reading Excel Xls File With Ole
Sep 26, 2010I'm trying to read an Excel xls file into a dataset with OLE. I can do that, but it's loosing data. The sheet is formatted with merged cells on the first 11 rows and after that it's just a table. I need to read this with OLE, because the server on which this web-application is working does not have Excel installed.
If I remove the first 11 rows with excel, then save it and then let my program read it, all is fine, but with those rows, it's ok. The excel sheet has header names in row 12. After the read in to the dataset, some of those cells with the header names are empty. I assume this is caused by the formatting. Is there any other way to open and read an excel file on a server without Excel or expensive dll's? Is it possible to open the xls file with OLE, delete the first 11 rows before using da.fill(dataset,tablename)?
Reading An Excel File Into A Combo Box?
Dec 7, 2009I am having problems reading the contents of an excel file into a combo box I am using the following code but the only thing that is populating the combo box is "System.__ComObject"
XLbook = GetObject(pthSup & "offices.xls")
XLsheet = XLbook.Sheets("Offices")
Dim i As Integer
[Code]....
I am relatively new Visual Basic and programming in general and I am trying to update a program I wrote for AutoCAD in VBA to the .NET frame work
Reading Records In Excel File With .net?
Aug 15, 2011just as I would read an SQL file in order with code such as:DCReader02 = DCCommand02.ExecuteReader()While DCReader02.Read() End While I am looking for the equivalent code to read each line of an Excel file until end of file. The Excel file was opened with
Microsoft.Office.Interop.Excel.Application / Workbook / Worksheet coding.
Reading ENTIRE Content Of An Excel File?
Oct 5, 2011I already know the basic procedure of how to read specific cells of an .xls file using VB.NET but I can't figure out how to automatically get all the data from such a file.Basically, I'm obtaining the data like this:
Dim xlApp As Excel.Application
Dim wb As Workbook
Dim ws As Worksheet
xlApp = New Excel.Application
[code]....
In this case, I know that there will be content in the first 10 rows of the columns A, B and C but what would I have to do if I had a huge document whose size and content might even change from time to time? I know that there is also an attribute ws.rows.count but this always returns a big value like 60000 even if only a few rows are occupied.So basically, I'm looking for a simple way to loop through all the used rows of an Excel file with the possibility of accessing each cell in that row.
Windows - CPU Usage Goes To 100% While Reading From Excel File?
Apr 5, 2012I created a VB.Net application that will read from excel file and put the data into a table.I used an excel sheet which has 3 columns and 65000 rows.Before starts reading the excel my machine's CPU Usage is around 15%, but during reading the CPU Usage jumps upto 95%.
Private Sub readFromExcel(ByVal fileName As String, ByVal sheetName As String)
Dim connString As String = "data source=XE; user=test; password=test"
Dim con As New OracleConnection(connString)[code].....
Reading Double Precision Values From Binary File?
Feb 19, 2010I am attempting to read a series of double prcision float values (x,y,z coordinates) from a binary file using the binary reader. Everything works fine except that when I read the number back it is different then the number that was written there (original file is generated by mining application).
written number : 78897.6476586
file contents hex : 40 F3 43 1A 5C CF 43 A4 this converts back to the same number as written using a IEE 754 conversion program. VB returned value : -5.45100266729248E-134 using .readDouble()
I have tried to step thru the file in one byte steps to make sure that I have the proper start position but that did not help any.
Reading In Data From One Excel File Write That Data To A Different Excel File?
Sep 28, 2011I am reading in data from an excel file that is only viewed inside the program. This excel file is being populated by data from multiple PLCs (7) through DDE links via RS Linx Gateway. I would like this data to be written to two different excel files and specific sheets within those so that it can be viewed later on.
My program has a form that will allow the user to view the data live, meaning they look at the first excel file from the program so that they are not able to edit the DDE links or change the file in any way. The other excel files (there will be two, one for good parts, one for bad parts) have specific sheets for each part and each tester station. For example, if the part is a ABC part, and it is a good part, and it was tester on tester station 1 then it needs to be saved to the good parts excel file, in the ABC sheet and in the good tester station 1 sheet.
If part XYZ comes along and is a bad part (fails testing) then it needs to be saved to the bad parts file, the XYZ sheet and the bad tester station 1 sheet.I might have added more detail than is needed to solve the problem but I thought I would add it anyways to help you all understand my problem a little better.
Limitations Of OLEDB Connection When Reading Excel File?
Feb 15, 2012I 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).
View 6 RepliesReading Excel File With Gembox - Columns.Count = 0?
Sep 1, 2011im usinf Gembox to read Excel files.I'm copying the fields to a datatable, so i have to add the columns to the datatable first.
Therefor im using this code:
For i As Integer = 0 To objWorksheet.Columns.Count - 1
objDataTable.Columns.Add(i, GetType(ExcelCell))
Next
But objWorksheet.Columns.Count is 0 even if theres data in 4 columns.
VS 2008 Reading Numbers In A Txt File Or Excel Spreadsheet
Mar 29, 2010currently i need to use 4 different texts files in order to read data and run my program, is there any way that i can just use 1 text file or 1 excel spreadsheet? here are my codes now.
Dim File1 As New System.IO.StreamReader("C:Documents and SettingsUserDesktopWindDirectionLanding.txt") 'Calling out the file.
Dim File2 As New System.IO.StreamReader("C:Documents and
[Code]....
VS 2010 - Reading Text File And Returning Values To Textbox
Apr 17, 2011I've a got a homework assignment that chooses one of four values in a list box, stores it in a text file. Secondly, on the display click event it should access the text file, read the line, store it in a variable and then display the totals in a text box. Works sort of fine except that it doesn't display the totals correctly. Code for both buttons is below. The variable are assigned in the mainform (Tried also in the display button and didn't change anything). The save button works fine and stores fine in the text file, it's just the reading that's the problem.
Private Sub saveButton_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles saveButton.Click
'save the new vote choices to a file
Dim votes As IO.StreamWriter
votes = IO.File.AppendText("votes.txt")
Dim voteSelected As String = CStr(commercialListBox.SelectedIndex)
[Code] .....
Office Automation :: Ow To Close Excel File After Reading Or Writing?
Nov 9, 2011I did ana application that interacts with excel (reading and writing files)But when the application ends and I close it, the excel file is still in the task manager procceses (ctrl+alt+del ->Proccesses)How can I completely close it?I'm using vb.net 2010 express
View 2 RepliesReading Excel File Whith Warning 'number Stored As Text'?
Jun 8, 2010Hi,in my application i have to read from an excel files and check the value of every cell i'm using an OleDb connection to open it and reading but i have this issue if some of the cells in the excel sheet is having this warning when i try to read it returns DBNull .knowing that i can not force the user for not having this warning ...i have to solve this within my code .
View 5 RepliesSearch Excel File For Values?
Oct 25, 2010I have a form with a couple of combo boxes. The first combobox adds items based on each row in an excel sheet.
Public Sub FetchExcelValues(ByVal ControlType As String, ByVal control As Object, ByVal xlApp As Object, ByVal xlWorkBook As Object, ByVal xlWorkSheet As Object, ByVal column As String, ByVal row As Integer)
[Code]....
This basically reads each cell in the specified column until it hits a blank cell. Then it takes the value of each cell and adds it as items to the first combo box. Now, what I want the code to do next is to take the selected item from this combo box and look for a match in another worksheet. When it finds a cell that matches, it should pick up the value from column B of the same row as the match. There might be more than one match as well, so every time it finds a match, I want to pick up the value of Column B of the same row and add THAT as items in the second combobox.
Cannot Read Numeric Values From Excel File
Sep 25, 2009I 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] .....
Read An Excel File - Loop Through Cells To Get Values?
Jul 25, 2008I'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?
View 7 RepliesSyncLock / Multithreading - Child Thread Reading The Values Of _do At The Same Time As Another Child Thread Is Reading The Values
Nov 13, 2009I have a dictionary object (let's call it _do) I am using to cache some values for use in a multi-threaded program. I have a single controlling parent thread, with a timer function _doTimer() which can kick off child threads with a new instance of class MyThreadObject in each. My parent thread has _do as a property and with each time _doTimer() gets called, it may or may not repopulate _do depending on cacheflag settings. I pass a reference to _do to each instance of MyThreadObject and those threads at some point read the values of _do but DO NOT write to it.
What I want is to ensure that the child threads do not try and read _do whilst the parent thread is writing to it. Same thing but very slightly different -> I also don't want the parent thread to write to _do whilst the child threads are reading from it. However there is no problem with 1 child thread reading the values of _do at the same time as another child thread is reading the values - so ideally I do not want each child thread to completely lock out read access, only locking out Write access.. The code is roughly like this:
[Code]....
VS 2008 Type Of File - Full Description - "Microsoft Office Excel Comma Separated Values File"
Apr 30, 2009When I look at a file on my hard disk, e.g. test.csv, when I look at the Properties of the file, it is officially known as, "Microsoft Office Excel Comma Separated Values File", and file types of .pdf are listed as "Adobe Acrobat Document", etc. etc. All of this information can be seen in Windows Explorer too when my folders are displayed by Details. How do you get at this "type of file" information with .NET?
View 2 RepliesReading Excel Files In Vb.net Leaves Excel Process Hanging?
Oct 23, 2009The 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]....