>if there any similar vfp inlist() command in C#?
>
>
>for eg.
>
>VFP Code:
>
>IF INLIST(postCode,'001','002','003')
>...
>ENDIF

You may try this one which is more universal:

        ' VFP inlist equivalent
        ' expO1 Item where all the items will be tried to look into
        ' expO2 Param array for a list of items
        Public Function Inlist(ByVal toItem As IComparable, ByVal ParamArray toItems() As IComparable) As Boolean
            Return Array.IndexOf(toItems, toItem) <> -1
        End Function