codice:
Public Class database
        Public ConnectionString As String
        Dim objConn As New OleDbConnection()
        Dim objCmd As New OleDbCommand()

        Public Function SelectSQL(ByVal strSelect As String) As OleDbDataReader
            
        End Function

        Public Function ExecuteNonQuery(ByVal strQuery As String) As Boolean
        End Function

        Public Function Controlla_Stringa(ByVal Campo As String) As String
        End Function
    End Class
io ho questa classe che vorrei utilizzare ogni volta che accedo e al db senza cosi riscrivere il codice.

Dove posso metterla e come la richiamo?