Подскажите пожалуйста
на этапе написания кода подчеркивает ApplicationClass и пишет подсказку "Interop type cannot be embedded. Use the applicable interface instead."
Чего не хватает?

Imports System.ComponentModel
Imports System.IO
Imports System.Data.OleDb
Imports System.Data
Imports System.Data.SqlClient
Imports Microsoft.Office.Interop.Excel
Imports System.Windows

Private Sub Button5_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button5.Click
Dim excelApplication As ApplicationClass = New ApplicationClass()
Dim excelWorkBook As Workbook = Nothing
Dim targetSheet As Worksheet = Nothing
Dim paramWorkbookPath As String = "C:\1.xls"
excelWorkBook = excelApplication.Workbooks.Open(paramWorkbookPath)
End Sub

няка,

чтото типа этого

Here it is enough to say that Excel.ApplicationClass derives from Excel.Application interface and one can even instantiate Excel using Excel.Application interface. Rewriting this code as below produces exact same results:

Excel.Application xlapp = new Excel.Application();