Career in Biztalk

hi all! I would like to seek suggestions from you… I have a good experience as Oracle DBA for about 18 months, certified as OCP. Now new projects required to learn Biztalk and I have learned and i am comfortable in working with Biztalk development. but i am confused, where my career is going? because i do not have any knowledge of .Net ( languages , ASP.NET), is it required to update myself with these skills to be expert in Biztalk? please let me know…how can i build my career in Biztalk..which are other skills to be acquired. thanks, sree