I have a VC++ DLL, which returns the sum of two long double values, passed as one dimensional array?

could anybody please tell the right syntax to pass array to this dll from vb.net

currently, my code snippet is as follows:

Imports System
Imports System.Collections.Generic
Imports System.Text
Imports System.Runtime.InteropServices
Imports System.Diagnostics
Public Class DllClass
    Private Const dllfilename As String = "D:\vc++_prgs\dll_array\Debug\dll_array.dll"

    <DllImport(dllfilename, EntryPoint:="read", CharSet:=CharSet.Ansi)> _
    Public Shared Function read(ByVal c() As Double) As IntPtr
    End Function
End Class


Public Class Form1

    Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
        Dim arr(2) As Double
        arr(0) = Convert.ToDouble(TextBox1.Text)
        arr(1) = Convert.ToDouble(TextBox2.Text)
        Dim res As Double = DllClass.read(arr)
        TextBox3.Text = res.ToString
    End Sub
End Class

Thanks in anticipation

>I have a VC++ DLL, which returns the sum of two long double values

<DllImport(filename, EntryPoint:="read")> Public Function read(ByVal d() As Double) As Double
    End Function
Dim dbl as Double = read(New Double() {22, 33})