Downcasts are done via :?>, upcasts via :> (or the upcast keyword if the type can be inferred).
Example:
1 2 3 4 5 6 7 8 9 10 11 12
> let s = "hi" :> obj;; val s : obj = "hi" > printfn "%s" (s :?> string);; hi val it : unit = ()
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I have
let filesList= Directory.GetFiles(directoryName)
let fileName=filesList.GetValue(index)
p.setName fileName
where fileName suppose to be string..