public IReadOnlyList<Field> GetFields()

public RowCursor SortWorldCities(FeatureClass worldCitiesTable)
{
    using (FeatureClassDefinition featureClassDefinition = worldCitiesTable.GetDefinition())
    {
        Field countryField = featureClassDefinition.GetFields()
          .First(x => x.Name.Equals("COUNTRY_NAME"));
        Field cityNameField = featureClassDefinition.GetFields()
          .First(x => x.Name.Equals("CITY_NAME"));

        // Create SortDescription for Country field
        SortDescription countrySortDescription = new SortDescription(countryField);
        countrySortDescription.CaseSensitivity = CaseSensitivity.Insensitive;
        countrySortDescription.SortOrder = SortOrder.Ascending;

        // Create SortDescription for City field
        SortDescription citySortDescription = new SortDescription(cityNameField);
        citySortDescription.CaseSensitivity = CaseSensitivity.Insensitive;
        citySortDescription.SortOrder = SortOrder.Ascending;

        // Create our TableSortDescription
        TableSortDescription tableSortDescription = new TableSortDescription(
          new List<SortDescription>() { countrySortDescription, citySortDescription });

        return worldCitiesTable.Sort(tableSortDescription);
    }
}

  public void RemoveFieldTableSnippet(Geodatabase geodatabase)
  {
      // Removing all fields from 'Parcels' table except following 
      // Tax_Code
      // Parcel_Address

      // The table to remove fields
      string tableName = "Parcels";

      TableDefinition tableDefinition = geodatabase.GetDefinition<TableDefinition>(tableName);
      IReadOnlyList<Field> fields = tableDefinition.GetFields();

      // Existing fields from 'Parcels' table
      Field taxCodeField = fields.First(f => f.Name.Equals("Tax_Code"));
      Field parcelAddressField = fields.First(f => f.Name.Equals("Parcel_Address"));

      FieldDescription taxFieldDescription = new FieldDescription(taxCodeField);
      FieldDescription parcelAddressFieldDescription = new FieldDescription(parcelAddressField);

      // Fields to retain in modified table
      List<FieldDescription> fieldsToBeRetained = new List<FieldDescription>()
{
  taxFieldDescription, parcelAddressFieldDescription
};

      // New description of the 'Parcels' table with the 'Tax_Code' and 'Parcel_Address' fields
      TableDescription modifiedTableDescription = new TableDescription(tableName, fieldsToBeRetained);

      SchemaBuilder schemaBuilder = new SchemaBuilder(geodatabase);

      // Remove all fields except the 'Tax_Code' and 'Parcel_Address' fields
      schemaBuilder.Modify(modifiedTableDescription);
      schemaBuilder.Build();
  }