VB .NET (.NET 2.0) Class Library configuration

If GetApplicationSetting("connectionString") Is Nothing Then
    Throw New Exception("Could not retrieve connection string from .config file")
Else
    Return ConfigurationManager.AppSettings.Item("connectionString")
End If

If GetApplicationSetting("connectionString") Is Nothing Then
    Throw New Exception("Could not retrieve connection string from .config file")
Else
    Return ConfigurationManager.AppSettings.Item("connectionString")
End If

ConfigurationManager.ConnectionStrings("MyConnectionString")