rp">public class _001_merge_first_and_last_name_to_fullname_field : IMigration
{
    private class Author : Entity
    {
        public string Name { get; set; }
        public string Surname { get; set; }
        public string FullName { get; set; }
    }

    public async Task UpgradeAsync()
    {
        await DB.Fluent&lt;Author&gt;()
                .Project(a =&gt; new { id = a.ID, fullname = a.Name + &quot; &quot; + a.Surname })
                .ForEachAsync(async a =&gt;
                {
          