how to print bills in tamil on a roll paper by sending rawdata to printer using vb 2008

Question

how to print bills in tamil on a roll paper by sending rawdata to printer using vb 2008

issues :

1 client is using dot matrix printer connected through usb.
2 using system.drawing ejects page as per default paper setting & paper could not be stopped at the end of the bill.
3 printing the bill using a batch file by invoking through shell command results in ????? being printed instead of the tamil characters.

sending rawdata in english to printer works fine, but we are not able to print the unicode characters.  please help.