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So far it works well. In my question I wrote the example in a bad way. I meant: 
...
if (CurrentUser.Identity.IsAuthenticated)
{
   PersonalizedData user = PersonalizedData.Load(CurrentUser.Identity.Name);
   string externalUserID =  user["externalSystemID"] ; //= "0123456789"
}
//öjje
                         
    
    
    
... if (CurrentUser.Identity.IsAuthenticated) { PersonalizedData user = PersonalizedData.Load(CurrentUser.Identity.Name); string externalUserID = user["externalSystemID"] = "0123456789"; }Anyone done this before and can help me out where to start. I’m using EPi 4.61, asp.net 2.0. Cheers Öjje