how to get know how many element in an array ?

[soulcaliburvn 0]

how to get know how many element in an array ?

I read help but i can't find any funtion can get size of array ...

While Not @error
        MsgBox(0,"", $WorkGroupnames[$i])
        $i += 1
    WEnd

D:\download\AutoitProject\test.au3 (11) : ==> Array variable has incorrect number of subscripts or subscript dimension range exceeded.:

I can't use @error to capture error when dimension range exceeded

[SmOke_N 203]

Ubound()