how to read the data from excel

Hi,
Use builtin OLEDB class fo read/write excel sheets. They supporting SQL queries like CREATE,SELECT etc..Below one simple article saying that how we can use OLEDB. There used CREATE query for creating a new excel sheet, but you can replace it with SELECT query.
http://www.c-sharpcorner.com/UploadFile/jaishmathews/861/?ArticleID=7b90e584-a5d5-4f02-a196-ea113f310d81