ADO Database VB.Net

Imports System
Imports System.Data.SqlClient
    Public Class MainClass
        Public Shared Sub Main()
            Using con As New SqlConnection
                con.ConnectionString = "Data Source=.\sqlexpress;Database=AdventureWorks;Integrated Security=SSPI;Min Pool Size=5;Max Pool Size=15;Connection Reset=True;Connection Lifetime=600;"
                con.Open()
                con.Close()
            End Using
            Using con As New SqlConnection
                con.ConnectionString = "Data Source=.\sqlexpress;Database=AdventureWorks;Integrated Security=SSPI;Pooling=False;"
                con.Open()
                con.Close()
            End Using
        End Sub
    End Class