SSIS package programmatically for excel source

I am creating SSIS package for Excel Source Programmatically. I am facing two issue in that

1.RuntimeWrapper.DTSConnectionManagerExcel100  how to get columns from this. while in case of flat file source

RuntimeWrapper.IDTSConnectionManagerFlatFile100(Flat file source) we can get columns.

2.While creating the package from BIDS we can set the property Run64BitRuntime - False. How to set this property progrmmatically.