Using the System.Web.Security.Membership in WinForms with Encrypted ConnectionString

I have created a simple web site which uses the security elements of the ASP.NET web site (i.e. Users, memberships, etc.) to create users, hash passwords, etc.
I am now creating a winforms application to enable users to be created from a desktop application that connects to the same Sql database.
The application I will be 'plugging' into already has an appConfig file which I am able to add the following code to:
<membership defaultProvider="MembershipDbSqlCeProvider"> <providers> <clear/> <add name="MembershipDbSqlCeProvider" type="System.Web.Providers.DefaultMembershipProvider, System.Web.Providers, Version=1.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" connectionStringName="UsersDbSqlCeConnection" enablePasswordRetrieval="false" enablePasswordReset="true" requiresQuestionAndAnswer="false" requiresUniqu ...