Не удается найти точку входа "Add" в DLL "MyDLL.dll"

Public Class Class1
    Public Function ADD(ByVal first As Integer, ByVal sec As Integer) As Integer
        Dim abc As Integer
        abc = first + sec
        Return abc
    End Function
End Class

Dim Result As Integer
Result = Add(1, 2)

Public Class Form4
Public Declare Function Add Lib "MyDLL.dll" _
(ByVal first As Integer, ByVal sec As Integer) As Integer
End Class

Public Declare Function Add Lib "MyDLL.dll" _
(ByVal first As Integer, ByVal sec As Integer) As Integer

Imports MyDLL.dll

Dim my_class As New MyDLL.dll."класс в которой находиться твоя функция, без кавичек"

TextBox1.Text = my_class.ADD(1, 2)

Public Class Class1
    Public Function addValues(ByVal first As Integer, ByVal sec As Integer)
        Dim abc As Integer
        abc = first * sec
        Return abc
    End Function
End Class

Public Class Form1
    Private Sub Button1_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles Button1.Click
        Dim first As Integer
        Dim sec As Integer
        first = 123
        sec = 125
        Dim my_class As New Testdll.Class1
        MsgBox(my_class.addValues(first, sec))
    End Sub
End Class