Sorry for the disturbance I've given; thanks to you, I could easily understood the problem that I've been ignoring from the beginning assuming that the control had a fault, not mine.

I was applying the where condition after a if (!IsPostback) condition so the initial binding was not included in the webcombo.

Once I removed this (extremely fool attempt of me) condition, everything worked file.

Seems like, all I need was somebody saying that "control is not the problem" afterall. 

Thanks

Thanks for the detailed answer and the sample code; I just like to ask if there's any possibility to do this using asp:linqDataSource 'cos you've given the sample with accessDataSource and I can't find the equivalent of the insertCommand etc. through the linqDataSource.

Thanks a lot