ExtractContentFormXML

using System;
using System.IO;
using System.Text;
using System.Text.RegularExpressions;


class ExtractContentFormXML
{
    static void Main()
    {
        using (StreamReader inputFile = new StreamReader("Input.txt");)
        {
            using (StreamWriter outputFile = new StreamWriter("Output.txt");)
            {
                string fileContent = inputFile.ReadToEnd();
                string content = Regex.Replace(fileContent, "<(.*?)>", " ");
                outputFile.WriteLine(content);
            }
        }
    }
}