how to extract data from text file??

/*--[ using directives ]---------------------------------------------------*/
using System.IO;

/*--[ Function ]-----------------------------------------------------------*/
/*
  Function Name   : ReadTxtFile_ToLst
  Description     : Reads data line- for line from a text file and stores
                    it to a list buffer.

  Access Modifier : public
  Param           : string txtFilePath

  Retval          : List<string>
*/
/*-------------------------------------------------------------------------*/
public List<string> ReadTxtFile_ToLst(string txtFilePath)
{
  List<string> returnValue = new List<string>();
  FileInfo genericFileInfo = new FileInfo(txtFilePath);
  StreamReader sr = genericFileInfo.OpenText();
  string lineContents;

  while (sr.EndOfStream != true)
  {
    lineContents = sr.ReadLine();
    returnValue.Add(lineContents);
  }

  sr.Close();

  return returnValue;
}