请问Asp.Net(vb)编写网页，如何调用模块中声明的函数？

请问Asp.Net(vb)编写网页，如何调用模块中声明的函数？程序里可以直接调用，在网页中应该怎么调用啊？公用函数一般的都写在哪里？模块？

模块：
Module Main_mod
Public SqlConn As New SqlClient.SqlConnection


#Region "连接数据库"
Public Function open(ByVal StrServer As String) As Boolean
Try
Dim myConnectionString As String
myConnectionString = "Server=" + StrServer + ";user id=ck;pwd=123456;database=test"
SqlConn = New SqlClient.SqlConnection(myConnectionString)
SqlConn.Open()
Return True
Catch
Return False
End Try
End Function
#End Region

End Module


web.aspx中
Sub Page_Load(sender As Object,e As EventArgs)
If open("127.0.0.1") = True Then
Response.Write("数据库连接成功！")
Else
Response.Write("数据库连接失败！")
End If
End Sub