Microsoft.ACE.OLEDB.12.0Treating data as text

Use this one when you want to treat all data in the file as text, overriding Excels column type "General" to guess what type of data is in the column.

Provider=Microsoft.ACE.OLEDB.12.0;Data Source=c:\myFolder\myExcel2007file.xlsx;
Extended Properties
="Excel 12.0 Xml;HDR=YES;IMEX=1";

If you want to read the column headers into the result set (using HDR=NO even though there is a header) and the column data is numeric, use IMEX=1 to avoid crash.

To always use IMEX=1 is a safer way to retrieve data for mixed data columns. Consider the scenario that one Excel file might work fine cause that file's data causes the driver to guess one data type while another file, containing other data, causes the driver to guess another data type. This can cause your app to crash.


This connection string (Treating data as text using Microsoft.ACE.OLEDB.12.0) can be used for connections to Excel 2007, Excel 2010 and Excel 2013.

Articlesread all »

Not the right connection string for you?

Start over in the connection string reference index.

You can also get help in the Q&A forums where you can ask your own question.

The kb articles contains how-tos and instructions and you can search for anything if you're not sure were to look.