Extract Info From XML File

using System;
using System.Collections.Generic;
using System.IO;
using System.Text;

class ExtractInfoFromXMLFile
{
  //Write a program that extracts from given XML file all the text without the tags. Example:
  //<?xml version="1.0"><student><name>Pesho</name><age>21</age><interests count="3"><interest> Games</instrest><interest>C#</instrest><interest> Java</instrest></interests></student>

  static void Main()
  {
    string inputFileName = "myText.txt"; //Full path to the file.If only a file name, then the file should be in the bin directory
    List<string> TextList = new List<string>();//List to store the clear content
    string xmlContent = ""; //String to stote file content
    int startIndex = 0, //Index to search for a tag characters
        lengthToEnd = 0,//This will store the length of the substring
        tempIndex = 0;//Index to search for a tag characters

    using (StreamReader readInputFile = new StreamReader(inputFileName))
    {
      xmlContent = readInputFile.ReadToEnd();//Read the whole file
    }
    while (tempIndex != -1)//While tempIndex returns a position for our tags
    {
      tempIndex = xmlContent.IndexOf('>', startIndex); //Find closing tag character
      if (tempIndex == -1) //If not found, break the cycle
      {
        break;
      }

      startIndex = tempIndex + 1; // Our substring should start from the next to the found position index

      tempIndex = xmlContent.IndexOf('<', startIndex); //Find opening tag character
      if (tempIndex == -1)//If not found, break the cycle
      {
        break;
      }

      if (tempIndex - startIndex > 1)//If there is something between the closing and opening tags >something<
      {
        lengthToEnd = tempIndex - startIndex; //Calculate the length of the substring
        TextList.Add(xmlContent.Substring(startIndex, lengthToEnd).Trim()); //Add the substring to the list. The Trim removes any white spaces before and after it
      }
      startIndex = tempIndex + 1; //Increase the startIndex for the next search
      lengthToEnd = 0;//Clear the length
    }
    using (StreamWriter writeOutputFile = new StreamWriter (inputFileName))
    {
      foreach (string line in TextList)
      {
        writeOutputFile.WriteLine(line);//Write the contents from our List by replacing the original file content
      }
    }
  }
}