Functional ADO.NET

Instead of: 

          reader =>
          {
               while (reader.Read())
              {
                  Console.WriteLine("{0}\t{1}\t{2}",
                  reader.GetInt32(0),
                  reader.GetString(1),
                  reader.GetString(2));
              }
          });

I sugest to abstract away the reader usage and put it inside the DataBase.ExecuteReader(...) method and replace the last parameter Action<IDataReader> action with Action<IDataRecord> and iterate inside the method, like so :
replace :
...
using (IDataReader reader = cmd.ExecuteReader())
{
       action(reader);
}
...

with :

using (IDataReader reader = cmd.ExecuteReader())
{
       while (reader.Read()) {
            action(reader);
      }
}

so:

          reader =>
          {
               while (reader.Read())
              {
                  Console.WriteLine("{0}\t{1}\t{2}",
                  reader.GetInt32(0),
                  reader.GetString(1),
                  reader.GetString(2));
              }
          });

becomes:

          record =>
          {
                  Console.WriteLine("{0}\t{1}\t{2}",
                  record .GetInt32(0),
                  record .GetString(1),
                  record .GetString(2));
          });


... and all loops are gone inside user code. (perfect candidate for thread level parallelism now  ).

Other than that nice vid and good way of using the old ado.net.