there are 2 droupdownlist .one has no.of month like jan,feb,march.......dec. and another droupdownlist has no of year. when i choose month and year then this current month every day like jan 1, jan 2, jan3 .......jan 31 show in gridview header single single column. same like as feb,march.....dec. how it is possible in asp.net,with c# language with example? .thank u sir