Incomprehensible data received from PostgreSQL

I have this problem reading "character varying" field data through a C# program from a PostgreSQL version 12 database table using npgsql. This is the code I use:

   NpgsqlDataSource DataSource = NpgsqlDataSource.Create(connectionString);
   NpgsqlCommand command = DataSource.CreateCommand("SET client_encoding = 'UTF8'");
   command.ExecuteNonQuery();

   command = DataSource.CreateCommand(this.Config.PostgreSQL_CommandString);
       int righe= command.ExecuteNonQuery();
       NpgsqlDataReader reader = command.ExecuteReader();
       while (reader.Read())
       {
           var v = reader.GetValue(1);
       }

The field contains, for example, the value ""Stanley Kubrick"" and what is read by the program (v variable) is "1\0\0\0\u00042\0\0\0\u0004T\0\0\0p".

I have already tried modifying the encode/decode and installing the latest versions of the dlls, but the result does not change. I would expect to be able to read the data correctly in readable format.

Do you have any suggestions? Thanks