Download Microsoft.ace.oledb.12.0 Provider For Both 64-bit =link= Today

Console.WriteLine(reader["YourColumn"].ToString());

This error stops data analysts, SQL developers, and system administrators dead in their tracks. The root cause? A mismatch between your application’s bitness (32-bit vs. 64-bit) and the installed OLEDB provider.

while (reader.Read())

SSMS 20 is a 32-bit application and requires the 32-bit ACE provider.

You simultaneously run 32-bit legacy software or a 32-bit version of Microsoft Office.

| Package | Description | Direct Download Link | | :--- | :--- | :--- | | | Supports 64‑bit applications. Use this if your app targets x64. | Download AccessDatabaseEngine_X64.exe | | 32-bit version | Supports 32‑bit applications. Use this if your app targets x86. | Download AccessDatabaseEngine.exe (32-bit) |

Once you have successfully installed the provider, your connection string should reference Microsoft.ACE.OLEDB.12.0 regardless of which redistributable you installed. For example:

If you have ever tried to read an Excel spreadsheet (.xlsx) or an Access database (.accdb) using a script or application—particularly in a —you have likely encountered the infamous error:

: If your specific legacy app strictly rejects the 2016 framework, you can source the archived Microsoft Access Database Engine 2010 Redistributable Files via the Internet Archive.

If you are setting this up for a specific platform, let me know:

By default, Microsoft prevents side-by-side installation because both installers register the same CLSIDs. However, there is an officially supported workaround: .

This error is almost always caused by a between the provider and the calling application.

Provider=Microsoft.ACE.OLEDB.12.0;Data Source=C:\MyFolder\MyOldWorkbook.xls;Extended Properties="Excel 8.0;HDR=YES";