MVC Razor DropDownList not populating value, system.data.datarow instead

I am diving into MVC and hit a snag.

In my home controller I am populating a ViewBag. Then I am trying to put that into a drop down list

Home controller:

 

string _connectionString = WebConfigurationManager.ConnectionStrings["xxxxxxx"].ToString();

            using (SqlConnection con = new SqlConnection(_connectionString))
            {
                //
                // Open the SqlConnection.
                //
                con.Open();
                //
                // The following code uses an SqlCommand based on the SqlConnection.
                //

            
                SqlDataAdapter _da = new SqlDataAdapter("Select Name from AspNetRoles", con);
                DataTable _dt = new DataTable();


                _da.Fill(_dt);
                
                ViewBag.RoleList = new SelectList(_dt.AsEnumerable());

                
                con.Close();
                
            }

Index.html :
 

@Html.DropDownList("Name", (IEnumerable<SelectListItem>)ViewBag.RoleList, "Select an application", "Name")

My dropdown populates the correct number of rows, however the proper text does not come up=> system.data.datarow is there 6 times

I am sure I am not converting something....can you help me with this easy newbie question?