Multiple datasource in combobox?

[Weapon]

i'm using DevExpress now. Now i want to add Combobox with each item is one datasource. Example: I have 2 items in combobox.If i choose item 1 with querystring is "SElect * from my table1" and bind in GridviewIf i choose item 2 with querystring is "SElect * from my table2" and bind in GridviewAnyone could help me please, i really need in my project. Thanks in advance!