ssrs 2 dataset ana dropdown List :)

hi everyonei'm new in ssrs i have a problem i have a 2 dataset for exempledataset1:select * from table Adataset2:select * from table BI want to make a dropdownlist with specify value 1-show table A (who list all attribut of my dataset1)2-show table B (who list all attribut of my dataset2)how can i do this an thank you very much Smile