What are different types of HTML Helpers?

There are three types of HTML helpers as given below:

1. Inline Html Helpers – These are create in the same view by using the Razor @helper tag. These helpers can be reused only on the same view.

   @helper ListingItems(string[] items)
   {
       <ol>
           @foreach (string item in items)
           {
               <li>@item</li>
           }
       </ol>
   }
   <h3>Programming Languages:</h3>
   @ListingItems(new string[] { "C", "C++", "C#" })
   <h3>Book List:</h3>
   @ListingItems(new string[] { "How to C", "how to C++", "how to C#" })

2. Built-In Html Helpers – Built-In Html Helpers are extension methods on the HtmlHelper class. The Built-In Html helpers can be divided into three categories-
   1. Standard Html Helpers
   2. Strongly Typed HTML Helpers
   3. Templated HTML Helpers
3. Custom Html Helpers – You can also create your own custom helper methods by creating an extension method on the HtmlHelper class or by creating static methods with in a utility class.

   public static class CustomHelpers {
       //Submit Button Helper
       public static MvcHtmlString SubmitButton(this HtmlHelper helper, string buttonText) {
               string str = "<input type=\"submit\" value=\"" + buttonText + "\" />";
               return new MvcHtmlString(str);
           }
           //Readonly Strongly-Typed TextBox Helper
       public static MvcHtmlString TextBoxFor < TModel, TValue > (this HtmlHelper < TModel > htmlHelper, Expression < Func < TModel, TValue >> expression, bool isReadonly) {
           MvcHtmlString html =
               default (MvcHtmlString);
           if (isReadonly) {
               html = System.Web.Mvc.Html.InputExtensions.TextBoxFor(htmlHelper, expression, new {@
                   class = "readOnly", @readonly = "read-only"
               });
           } else {
               html = System.Web.Mvc.Html.InputExtensions.TextBoxFor(htmlHelper, expression);
           }
           return html;
       }
   }