public enum SortOrder : System.Enum, System.IComparable, System.IConvertible, System.IFormattable, System.ISpanFormattable  

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);
    }
}