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For update the content in the cell or modify the content in a cell , We can use the Imports System. Ole Db Command Dim sql As String My Connection = New System. Let me know if you still have questions or if I'm not fully understanding the problem. Here we are using Ole Db Connection , Ole Db Data Adapter , Data Set for doing these operations in an Excel file. Data Public Class Form1 Private Sub Button1_Click(By Val sender As System. OLEDB.4.0; Data Source=" _ "'c:\testfile.xls'; Extended Properties=Excel 8.0;") My Connection. Connection = My Connection sql = "Update [Sheet1$] set name = 'New Name' where id=1" my Command. For update the content in the cell or modify the content in a cell , We can use the UPDATE command like in SQL Operations.Is there a free or open source library to read Excel files (.xls) directly from a C# program?It does not need to be too fancy, just to select a worksheet and read the data as strings. OLEDB.4.0; data source=; Extended Properties=Excel 8.0;", file Name); var adapter = new Ole Db Data Adapter("SELECT * FROM [work Sheet Name Here$]", connection String); var ds = new Data Set(); adapter. Tables["any Name Here"]; If seems like the Select in this approach tries to guess the data type of the column and force upon that guessed data type.

If you have a column with what looks like integers in the first rows you will encounter an error when you hit a non-integer (e.g. NET approach is quick and easy, but it has a few quirks which you should be aware of, especially regarding how Data Types are handled.

If I create a new sheet it works fine, however then I have too many sheets and I am unable to delete any sheets. Does your code work on a spreadsheet that already contains data?

I have created a blank file with the default excel sheets (I have also tried with a custom sheet.) For some reason I am unable to write a full row of data to the sheet. Execute Non Query(); I think you have to use INSERT INTO instead of UPDATE, since the cells don't actually contain any data and so can't be updated.

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NET inserts a row when you create the sheet that has the row header names. I'm trying to have just 1 sheet after I insert the data.

I can't seem to find a way around that besides going in after I insert everything and removing the first row. If I do create table I'd need to somehow drop a table but the drop command was not working for me. Modified the code to use an existing sheet from a default workbook (w/ 3 sheets). If you use the code I had before, it will create a workbook with just one sheet (tested on Excel 20).

If it is just simple data contained in the Excel file you can read the data via ADO. The quickest way is to let some other poor SOB do this for you.

That's why people use frameworks instead of writing everything from the bottom up.

So far, I've been using Export to Unicode text function of Excel, and parsing the resulting (tab-delimited) file, but I'd like to eliminate the manual step. Get Current Directory()); var connection String = string. For example, if you have a column with mostly double values, it won't like you passing x.

This question exists because it has historical significance, but it is not considered a good, on-topic question for this site, so please do not use it as evidence that you can ask similar questions here. Field is just used to attempt to cast the contents in the column to a type.