DropDownList.Optgroup.MVC (nuget): HTML5 <optgroup> tag in MVC  There is no built-in support in the framework for this kind of drop down lists.  The <optgroup> is used to group related options in a drop-down list. Documentation/DEMO http://bhaumikpatel.github.io/DDL.optgroup.MVC.Demo/
Keywords: MVC|optgroup|DropDownList|HtmlHelper