Simple.Data ResultSet to CSV

CSVHelper.cs

public static class CSVHelper
{
    /// <summary>
    /// Usage:
    /// CSVHelper.ToCsv(
    ///    ",",
    ///    resultSet,
    ///    new List<KeyValuePair<string, string>>
    ///    {
    ///        new KeyValuePair<string,string>("caf_no", "'")
    ///    }.ToArray()
    /// )
    /// </summary>
    /// <param name="separator"></param>
    /// <param name="resultSet"></param>
    /// <param name="encapsulations"></param>
    /// <returns></returns>
    public static string ToCsv(string separator, SimpleResultSet resultSet, params KeyValuePair<string, string>[] encapsulations)
    {
        string header = String.Join(separator, resultSet.GetDynamicMemberNames().Select(f => f).ToArray());
        IEnumerable<SimpleRecord> objectlist = resultSet.ToList<SimpleRecord>();

        StringBuilder csvdata = new StringBuilder();
        if (string.IsNullOrWhiteSpace(header) == false)
            csvdata.AppendLine(header);

        foreach (var o in objectlist)
        {
            var item = o.ToDictionary(x => x.Key, x => x.Value == null ? string.Empty : x.Value.ToString().Replace(separator, "$"));

            foreach (var encapsulation in encapsulations)
            {
                if (item.ContainsKey(encapsulation.Key))
                {
                    item[encapsulation.Key] = encapsulation.Value + item[encapsulation.Key];
                }
            }

            if (string.IsNullOrWhiteSpace(header) == true)
            {
                header = String.Join(separator, item.Select(f => f.Key).ToArray());
                csvdata.AppendLine(header);
            }
            var row = String.Join(separator, item.Select(f => f.Value).ToArray());

            csvdata.AppendLine(row);
        }

        return csvdata.ToString();
    }
}