How to add 1 line header in write side

bool bFirstLine = true; public object DoWork() { if (bFirstLine == true) { // only write additional header line for the first time bFirstLine = false; // Get the Textfile adapter on the WRITE side TextFileAdapter adapter = (TextFileAdapter)AdapterWrite; // get the filename string filename = adapter.Filename; if (File.Exists(filename)) File.Delete(filename); string header = String.Empty; // write all input parameters to a separate header line for (int i = 0; i < InValues.Length; i++) { string sTemp = (string)InValues[i].GetString(); if (sTemp == null) sTemp = String.Empty; if (header.Length > 0) header += "\r\n"; // Newline header += sTemp; } // Create the text file and write the custom header data File.WriteAllText(filename, header); } return false; // just for Filter Heater, false = no filtering }