(Please forgive me if I’m missing something obvious — I'm quite new to C# and ASP.NET!)
 
When I run Membership.UpdateUser(user) when user.Comment == null, I get a System.Configuration.Provider.ProviderException “Error while performing database query.” The InnerException is System.Data.SqlClient.SqlException “The parameterized query '(@UserName nvarchar(5),@Email nvarchar(18),@Comment nvarchar(400' expects the parameter '@Comment', which was not supplied.”
 
Membership.CreateUser sets the comment field to null, so it seems to me that the provider’s query shouldn’t be assuming it has a value.
 
I’m not 100% sure, but I believe UpdateUser wasn’t doing this in 2.4.0, and has started in 2.4.1. It’s trivial to ensure that the comment field isn’t null, but it shouldn’t be necessary.
 
Thanks!