The Goal of creating custom htmlhelper is to reduce the html content you write if you use the template many times as you can get data and format it in html form  , So Html Helper method acts as wrapper for data and html as it returns string of html .

    Creating HtmlHelper is simply using Extension Method , Like this

      public static class MyCustomHtmlHelper
    {
        public static string CustomHtmlHelper(this HtmlHelper html, 
string htmlContent)
        {
           return "<p>this my first html helper </p>";
        }
     }