Alternative ways to read excel in Sharepoint

Now I'm facing with a problem of reading excel file on SharePoint server.

In the old ways I usually use the OLEDB to read excel through the connection string, but it's just work on 32 bit system, then I attempt to convert my app to x86 platform target, but unfortunately my app (is a WebPart) which SharePoint is not allowed to work with.

I do many googling and hearing SharePoint Module (Microsoft.SharePoint.dll) can do that but I can't find any references. Anyone know and can you help me?

Thanks.