How to use the Profile other than default

Hello,
I'm making another attempt to find out how to use a different profile in the web application. I though it would be quite simple. but couldn't find an answer anywhere.
All I need to know is how to call "i90ProfileProvider" instead of default "i90PartnerProfileProvider" in C# or VB.
<profile defaultProvider="i90PartnerProfileProvider">
<providers>
<clear/>
     <add name="i90PartnerProfileProvider" type="System.Web.Profile.SqlProfileProvider" connectionStringName="i90Partner"/>
     <add name="i90ProfileProvider" type="System.Web.Profile.SqlProfileProvider" connectionStringName="i90"/>
</providers>
There must be the way to do this. For user it works just fine:
MembershipUser user=
Membership.Providers["providernam ...