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Overwrite Data in Excel file with OleDb C#?

is it possible to overwrite data in cells with OleDb in C# with a specific row range?
I only found adding data to first empty cells in specific column like
string sql = "Insert into [Tabelle1$] (testA, testB) values(6,7)";
If its not possible what assembly is fast for this task ....Microsoft.Office.Interop is horrible slow.
Thanks for any tip

Skip first cell & last cell - From Excel to DataTable in C# with Open XML

I have implemented this code as mentioned here :
From Excel to DataTable in C# with Open XML
My excel is like this :
So now the code which I wrote does not work as I am unable to skip the first row with unwanted text.
I need to skip the first row & last row, extracting data only from the columns & rows
Please help

The easiest way to read an Excel file is to use EPPlus library.
You could then take a look at the following examples to import your worksheet into datatables here or here.
Hope this helps !

Insert Excel row using format from row below, not above

I need to insert a row into an existing Excel worksheet using C# but keep the existing formatting.
The default behaviour in Excel is to use the formatting of the row above, which in some cases is what I don't want as this could be different.
I am sure I have seen that there is a way to specify using the format of the row below rather than from the row above but I can't find it now.
Does anyone know how to specify this?
This is the code I am using:
sheet.Range[string.Format("{0}:{0}", row)]
.EntireRow
.Insert(
Excel.XlInsertShiftDirection.xlShiftDown);

You need to use the CopyOrigin parameter as well.
sheet.Range[string.Format("{0}:{0}", row)]
.EntireRow
.Insert(
Excel.XlInsertShiftDirection.xlShiftDown,
Excel.XlInsertFormatOrigin.xlFormatFromRightOrBelow
)
See here for details on Insert and that enum.
It is possible to get this parameter by recording a macro. There is a small box that pops up when you insert the row to choose where the formatting comes from.

Parsing data from xls and added to a data grid view using c#

I am trying to read a folder that contain a number of xls files (27) and i need to read only 3 specific columns after 21 row e.g. A21,: B21,: ... In a new column a would like to have just the sum of the previous columns. I am thinking to insert a database grid and to insert there the parsing data. My problem is that i have never try to read something from xls. Do you have any ideas. Thanks in advance! (All the data are in the same workshhet in all workbooks)

Importing an Excel WorkSheet into a Datatable

I have been asked to create import functionality in my application. I am getting an excel worksheet as input. The worksheet has column headers followed by data. The users want to simply select an xls file from their system, click upload and the tool deletes the table in the database and adds this new data.
I thought the best way would be too bring the data into a datatable object and do a foeach for every row in the datatable insert row by row into the db.
My question is what can anyone give me code to open an excel file, know what line the data starts on in the file, and import the data into a datable object?

Take a look at Koogra.
You instantiate a WorkBook object from a path to an XLS file.
You access a WorkSheet object from the workbook's Sheets property.
You can enumerate over the rows in the worksheet by accessing the sheet's Rows property from index MinRow to MaxRow.
You can enumerate over the cells in a given row by accessing the row's Cells property from index MinColumn to MaxColumn.
Each cell has a Value property (object) as well as a FormattedValue method (string).
Give it a try -- I've found it to be extremely intuitive and easy to use.

You can make use of an OleDbConnection to connect to excel file and the query it using SQL queries.
If it is an Asp.Net application, then you make use of the FileUpload control and get the bytes from the file. Then you will have to manually convert it to a datatable.
Try out these links:
OleDbConnection to excel file
Byte array to datatable

What your looking for is the concept described Here
Providing you dont want to use a third party library anyway, else Dans solution will suit you

First you have to download the dll file namely
NExcel.dll
By using this dll you can make various object which are very useful for
import excel data in .net using both vb as well as c#.
Good luck.