vb.net - Combobox Datasource assign to Datatable -

how convert datasource of combobox datatable in vb.net? know how assign datatable combobox. in case need opposite way.

like:

dim dt datatable = combobox1.datasource

is possible?

i use trycast job done.

dim dt datatable = trycast(combobox1.datasource, datatable)  if dt nothing     ' didn't work because it's not datatable     ' editors: did not reduce expression     '          emphasize need check 'nothing'     '          , handle appropriately. else     ' yay it's datatable end if