I am trying to insert a null guid directly to the DB. I use the following snippet
QueryColumnExpression nullParameter =
Column.Parameter(DBNull.Value, new GuidDataValueType(UserConnection.DataValueTypeManager));
I get the following exception
System.NotSupportedException: The CLR type Terrasoft.Core.DB.QueryColumnExpression isn't supported by Npgsql or your PostgreSQL. If you wish to map it to a PostgreSQL composite type you need to register it before usage, please refer to the documentation.
If this is not a suitable way, which is the proper way to insert a null guid directly in a PostgreSQL db from C# code ?