The Server and Database are both blank so constring will not be correct - it's "Data Source=;Initial Catalog= ;Integrated Security=True;"
Your class clsMSSQL is badly constructed. Try the following instead
Imports System.Data.SqlClient
Public Class clsMSSQL
Private _Server As String
Private _Database As String
Public Property Server() As String
Get
Return _Server
End Get
Set(ByVal value As String)
_Server = value
End Set
End Property
Public Property Database() As String
Get
Return _Database
End Get
Set(ByVal value As String)
_Database = value
End Set
End Property
Public ReadOnly Property constring() As String
Get
Return "Data Source=" & _Server & ";Initial Catalog=" & _Database & " ;Integrated Security=True;"
End Get
End Property
End Class
Etc ... I haven't included the other bits you will need to change in a similar way