title: convert string to html (hyperlink)
body: <p>i defined ToHtml() extension for string class and convert break to <code>&lt;br/&gt;</code>.
  how can detect hyper link and convert to <code>&lt;a&gt;</code> element?</p>
  
  <pre><code>public static class StringExtension
  {
      public static string ToHtml(this string item)
      {
          //\r\n windows
          //\n unix
          //\r mac os
          return item.Replace("\r\n", "&lt;br/&gt;").Replace("\n", "&lt;br/&gt;").Replace("\r", "&lt;br/&gt;");
      }
  }
  </code></pre>
  
  <p>c#, asp.net</p>