hubFS: THE place for F#

The following code issues a warning FS0020: This expression should have type 'unit', but has type 'DirectoryInfo'.

How can I sequence expressions to avoid such warnings?

Thanks.

#light
open System.IO
match Directory.Exists("c:/mydir") with
| true -> ()
| false ->
    Directory.CreateDirectory("c:/mydir")
    printfn "%s\n" "Directory created with success."

That's because of CreateDirectory... hence you may use :

match Directory.Exists("c:/mydir") with
| true -> ()
| false ->
    ignore <| Directory.CreateDirectory("c:/mydir")              
    printfn "%s\n" "Directory created with success."

or, equivalently,

match Directory.Exists("c:/mydir") with
| true -> ()
| false -> 
    let _ = Directory.CreateDirectory("c:/mydir")              
    printfn "%s\n" "Directory created with success."