How to Import Excel Sheet to SQL Server (all ms office versions)

Hi.....

I want a generic function to import excel sheet data to a table in sql server 2005. I am using one table only but i want to import
MS Office 2010 excel file, ms office 2007 file, 2003 file. Kindly give connection strings of these and please tell me how to import using a asp.net form .


Thanks and Regards

Sankar