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Extracting Html strings from html source

    Question

  • please HELP !!!!

    I've got this html source:

                                                            

    <!DOCTYPE html>
    <html itemscope itemtype="http://schema.org/QAPage">
    <head>
    <tr>
                <td class="votecell">
    <div class="vote">
            <input type="hidden" name="_id_" value="42472322">
            <a class="vote-up-off" title="This question shows research effort; it is useful and clear">up vote</a>
            <span itemprop="upvoteCount" class="vote-count-post ">0</span>
            <a class="vote-down-off" title="This question does not show any research effort; it is unclear or not useful">down vote</a>
            <a class="star-off" href="#">favorite</a>
            <div class="favoritecount"><b></b></div>
    </div>
                </td>
    <td class="postcell">
    <div>
        <div class="post-text" itemprop="text">
    <blockquote>
      <p><strong>I want to find out the chatID or username of the the new user who joins my telegram channel where my telegram bot is one of its
      admins.</strong></p>
    </blockquote>
    <p>Also I want to know whether I can get the users list of my channel using my bot admin or not?</p>
    <p>Let say that I'm using NetTelegramBotApi in C#, I have tried the below code but didn't worked:</p> <pre class="lang-cs prettyprint prettyprinted"><code><span class="kwd">if</span><span class="pln"> </span><span class="pun">(</span><span class="pln">update</span><span class="pun">.</span><span class="typ">ChannelPost</span><span class="pun">.</span><span class="typ">NewChatMember</span><span class="pln"> </span><span class="pun">!=</span><span class="pln"> </span><span class="kwd">null</span><span class="pun">)</span><span class="pln">
    </span><span class="pun">{</span><span class="pln">
    </span><span class="typ">Console</span><span class="pun">.</span><span class="typ">WriteLine</span><span class="pun">(</span><span class="pln">update</span><span class="pun">.</span><span class="typ">ChannelPost</span><span class="pun">.</span><span class="typ">NewChatMember</span><span class="pun">.</span><span class="typ">Id</span><span class="pun">.</span><span class="typ">ToString</span><span class="pun">());</span><span class="pln">
    </span><span class="kwd">continue</span><span class="pun">;</span><span class="pln">
    </span><span class="pun">}</span></code></pre>
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            <a href="/questions/tagged/c%23" class="post-tag js-gps-track" title="show questions tagged 'c#'" rel="tag">c#</a> <a href="/questions/tagged/console-application" class="post-tag js-gps-track" title="show questions tagged 'console-application'" rel="tag">console-application</a> <a href="/questions/tagged/telegram" class="post-tag js-gps-track" title="show questions tagged 'telegram'" rel="tag">telegram</a> <a href="/questions/tagged/telegram-bot" class="post-tag js-gps-track" title="" rel="tag">telegram-bot</a> 
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    <div class="post-menu"><a href="/q/42472322" title="short permalink to this question" class="short-link" id="link-post-42472322">share</a><span class="lsep">|</span><a href="/posts/42472322/edit" class="suggest-edit-post" title="">improve this question</a></div>        
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        <div class="user-action-time">
            <a href="/posts/42472322/revisions" title="show all edits to this post">edited <span title="2017-02-26 19:27:54Z" class="relativetime">24 mins ago</span></a>
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            asked <span title="2017-02-26 18:17:55Z" class="relativetime">1 hour ago</span>
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            <a href="/users/3929525/naser-sadeghi"><div class="gravatar-wrapper-32"><img src="https://i.stack.imgur.com/4poyn.jpg?s=32&amp;g=1" alt="" width="32" height="32"></div></a>
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            <a href="/users/3929525/naser-sadeghi">Naser.Sadeghi</a>
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            </tr>
    </body>
    </html>

    what I need is to extract only the " code " which located between < pre > and </pre> in this source and save it in another html page.  I want my code definitely in C#. I've tried to use HtmlAgilityPack several times before but I got no useful result. please any one could help me in that and I would be pretty grateful. this is my last attempt in C# code: 

    using System;
    using System.Collections.Generic;
    using System.Linq;
    using System.Text;
    using HtmlAgilityPack;
    using System.Web;
    using System.IO;
    using System.Xml;
    using System.Xml.XPath;

    namespace ConsoleApplication41
    {
        class Program
        {
       
            static void Main(string[] args)
            {
                HtmlAgilityPack.HtmlDocument htmlDoc = new HtmlAgilityPack.HtmlDocument();
                htmlDoc.OptionFixNestedTags = true;
                //   htmlDoc.Load("file://F:/17.txt.html");

                htmlDoc.LoadHtml("file://F:/17.txt.html");

                if (htmlDoc.DocumentNode != null)
                {
                    HtmlAgilityPack.HtmlNode codeNode =
        htmlDoc.DocumentNode.SelectSingleNode("//code");
                    htmlDoc.Save("F:/test/file-1.txt");
                }
            }
        }
    }
                    


    Wednesday, March 29, 2017 9:53 AM

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