title: Display html containing iFrame in Windows Form c#
body: <p>i am creating a window application as well as a web application using c#. Scenario is like below:<br/>
  1. Admin will post messages using Wysiwyg editor( i am using tinyMCE) from the website <br/>
  2. User will have windows form that will be download the  message and display it on the form.
  <br>
  I have taken a <a href="http://msdn.microsoft.com/en-us/library/aa752040%28VS.85%29.aspx" rel="nofollow noreferrer">webBrowser</a> control to display it. its working fine to display html( formatted text along with picture). problem  occurs when we want to display video on it.</p>
  
  <p>I am using following code for that:
   webBrowser1.Navigate("about:blank");</p>
  
  <pre><code>            HtmlDocument doc = this.webBrowser1.Document;
              doc.Write(String.Empty);
              string strHTML="&amp;lt;p&amp;gt;&amp;lt;iframe src=&amp;quot;http://www.youtube.com/embed/xXdDjnVM1kI&amp;quot; frameborder=&amp;quot;0&amp;quot; width=&amp;quot;425&amp;quot; height=&amp;quot;350&amp;quot;&amp;gt;&amp;lt;/iframe&amp;gt;&amp;lt;/p&amp;gt;\r\n&amp;lt;p&amp;gt;&amp;lt;span style=&amp;quot;color: #ff0000; font-size: xx-large;&amp;quot;&amp;gt;Hi, &amp;lt;/span&amp;gt;&amp;lt;/p&amp;gt;\r\n&amp;lt;p&amp;gt;&amp;lt;span style=&amp;quot;color: #33cccc; font-size: large;&amp;quot;&amp;gt;Enjoy Ganganam Style&amp;lt;/span&amp;gt;&amp;lt;/p&amp;gt;\r\n&amp;lt;p&amp;gt;&amp;amp;nbsp;&amp;lt;/p&amp;gt;";
              string strDecoded=System.Net.WebUtility.HtmlDecode(strHTML);             
              webBrowser1.DocumentText = strDecoded;
  </code></pre>
  
  <p>Its showing me security alert while running it:
  <img src="https://i.stack.imgur.com/grjnc.jpg" alt="Error message"></p>
  
  <p>When i add these sites in the trusted site, it works fine. but i want to get ride of these security warning. for that i have tried <code>webBrowser1.ScriptErrorsSuppressed = true;</code>, but its not working also. and also tried <a href="https://stackoverflow.com/questions/12999735/how-to-programmatically-answer-yes-to-webbrowser-control-security-alert">How to programmatically answer &quot;Yes&quot; to WebBrowser control security alert</a>. 
  <br>
  When <code>webBrowser1.ScriptErrorsSuppressed = true;</code> then iFrame come like below:
  <img src="https://i.stack.imgur.com/UctWT.jpg" alt="error">
  But i have Adobe Flash Player, and i can play the video by adding the warning site in the trusted sites manually. </p>
  
  <p>Is there any option to avoid these and play the video? any kind of help and suggestion is appreciated. </p>