How to pass Array as Function Parameter in Webservice VB.NET?

WebMethod() _
      Public Function InsertProduk(ByVal key As Array, ByVal val As String, ByVal konter As Integer) As DataSet
        Dim conn As String
        Dim i As Integer = konter
        For a As Integer = 0 To i
            conn = "server=localhost;uid=root;pwd=;database=miles"
            Dim sql As String = "insert into trade set id_pro="' + key(i) + '";
            Dim konek As New MySqlConnection(conn)
            Dim OdbcDa As New MySqlDataAdapter(Sql, conn)
            konek.Open()
            Dim ds As New DataSet
            OdbcDa.Fill(ds)
            konek.Close()
            Return ds
        Next
    End Function

Imports System.Web
Imports System.Web.Services
Imports System.Web.Services.Protocols
Imports System.Data
Imports MySql.Data
Imports MySql.Data.MySqlClient
Imports MySql.Web
Imports MySql.Web.SessionState