im 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.
I am currently using Gembox to pass text to excel and I have a problem. I have imported the required resources but when I try to pass an item in a list box it comes to an error..here's my code
'checkrow is a number loaded from that same excel
Dim ef As ExcelFile = New ExcelFile
ef.LoadXls("C:\Users\DF\Desktop\registro_prestamos.xls")
[code].....
I am reading XLS files, via JET provider, using the following
Dim conString As String = "Provider=Microsoft.Jet.OleDb.4.0;data source=" + fileName + ";Extended Properties=""Excel 8.0;HDR=Yes;IMEX=1;"""
cn = New OleDbConnection(conString)
cn.Open()
da = New OleDbDataAdapter("SELECT * FROM [" & sheetname & "]", cn)
da.Fill(dt)
The problem I am facing now is that some of these excel files have hidden columns: These columns are meant to be ignored. However, the code above fills my datatable with ALL columns (hidden and nothidden). Is there any "Extended Property" that I could add to the connection string, to ignore hidden columns?
Reading Excel in .NET - some columns are read in as null
View 10 RepliesIn my application I read data (using data binding) from an Excel spreadsheet into a DataGridView. This works, but the data columns contain text fields (strings). I would like to set the data type for some columns to "Date" and Decimal. I cant do this on the DataGridView (error: cant change properties for data-bound stuff) and I cant figure out how to do it on the dataset or data-table that I bind to the DataGridView.The following is the code I use to read and bind the data:
Using con As OleDbConnection = New OleDbConnection(cs)
'
'open the OleDbConnection
[code]....
The commented out code (below the 'Todo: comment) causes a additional table, but I want to change the table with the data.
Declare some class level variables that will keep track of the sums for each column. For example:
[Code]....
During the RowDataBound event, retrieve the data from each column and add it to the appropriate sum. I'm not sure if you are developing an ASP.NET application or a Win-forms desktop application so I cannot help you any further at this point. What have you tried so far to solve the problem?
I have the below Linq query that is returning the data but I need to aggregate the columns to group on the Period and Sum the Count columns. How do I go about doing this?
LINQ
from t In tblTimes
join h In tblEngineeringDashboard_CADMachinesCounts on t.ID Equals h.TimeID
Order By t.Period
[code].....
I haven't used VB in 2 years and have forgetten way too much, but I still understand quite a bit. I just can't synthesize it.
Anyways, here is what I am struggling to do.
I have a CSV file as formatted in the screenshot at this link:[URL]
Number of rows can change but the number of columns won't.
I need to:
1:read in a csv file
2:take the second column save the first and last number as a variables for computations (these numbers will be the smallest and largest numbers, respectively if that makes it easier to program)
3:put into the first column of a new array the following computations based on the 2nd column from the csv file computation=((array value-first number)/(last number-first number)*100)
4:add to first column the same computations again but +100 i.e. if the first row had a cell that had computed to 1 then the next number would be 101
5:add to first column again the same computations again but with an addition +100 (+200 total) this should cause the column to have numbers between 0 and 300
6:write column 3 of array to 2nd column of the new array
7:write column 4 of array to the end of 2nd column of the new array
8:write column 5 of array to the end of 2nd column of the new array
9:delete excess array space
10:write new array to txt file with delimiter of " " (a tab) with the same name as the previous file
I have been looking at this for 6 hours now and although I figured out how to read in a csv file, I was not able to figure out how to call up the individual values for computations.
I won't complain if you give me code but what I really want is an understanding of what I need to do to accomplish this.
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].....
I wish to modify a pre-existing procedure to import just the first four out of five columns from an Excel .xls file, which may be viewed as a "physical file" on the local hard drive.
[Code]...
how to open an existing XL file and copy a column of data and then paste it to a column of another existing XL file ?
View 1 RepliesHow do I open, edit, read excel columns in vb.net? Like, for example, I want to know the values of column B up to the cell that it contains values.
View 1 RepliesI want to edit the rows and columns of an excel file using vb 2010 express. NOTE : I dont want to open .exl file but want my program to read and edit them according to user. PS : I want to edit them according to cell number.
View 6 RepliesI am dealing with survey data at the moment and i am interested in extracting data of identical 5 columns from 3 excel files and then aggregate them into one excel file.below is the code im working on, fairly new to VBA so my apologies if my code doesnt make sense to you.
Sub extraction()
Dim a As Range
Dim r As Range
Dim wbSource As Workbook
Dim wbDestination As Workbook
[Code]...
I'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)?
I 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
just 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.
I 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 Repliesi am not getting the integer values in dataset while reading from an excel files the field which is integer will be showing as NULL.
View 1 RepliesI 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.
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
I 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].....
Textboxes are arranged in a 5x5 matrix and each text box is only restricted to either a "1" or "0" input. I need help in the code that will count all 1's in each row and column. Since this is a 5x5 arrangement, there are 5 rows and 5 columns each. I am actually making a simulation of a VRC/LRC program. There will be 2 buttons namely "Even/Odd Parity". If user presses Even parity and the number of 1's in that specific row/column is Even, the result will be a 0,If odd the result is 1. There is a result textbox at the end of each row/column.
View 1 RepliesI 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.
I 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 Repliescurrently 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]....
I 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 Repliesi have a DataGridView bound to a table that has 22 fields in it. In the datagridview columns, the first 2 have the visible property set to false and the last 7 also set to false. This works since there are 13 columns displayed in the datagridview when the program runs. Here's where my issue come in. When I do the following, Console.WriteLine("Column count = " & DataGridView1.Columns.Count.ToString()), I get the expected "Column count = 22 in the output. However, when I do Console.WriteLine("Visible = " & DataGridView1.Columns.GetColumnCount(DataGridViewElementStates.Visible)), I get 20 instead of the expected 13 that actually have the property set to visible.
[Code]...
Hi,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 Repliesim wondering which way may be better to find out the number of cols for a row:
1) row.Table.Columns then count
2) row.ItemArray then count
3) am i missing something, is there a much more "direct" way to do it?