public static StringDataFrameColumn Add(string value, StringDataFrameColumn right) { StringDataFrameColumn ret = right.Clone(); for (int i = 0; i < ret._stringBuffers.Count; i++) { IList <string> buffer = ret._stringBuffers[i]; int bufferLen = buffer.Count; for (int j = 0; j < bufferLen; j++) { buffer[j] = value + buffer[j]; } } return(ret); }