dropdownlistfor in mvc 5 razor example

Example 1: drop down list mvc5

@Html.DropDownList("MySkills", (IEnumerable  
        <SelectListItem>)ViewBag.MySkills)

Example 2: razor dropdownlistfor

@using MyMVCApp.Models

@model Student

@Html.DropDownListFor(m => m.StudentGender, 
            new SelectList(Enum.GetValues(typeof(Gender))), 
            "Select Gender")