You have to do two things to fix your problem. The first one is to change the GetOccupation method with the following implementation
public List<Occupation> GetOccupation()
{
return GetData.AllOccupation();
}
Then you have to change the dropdown initialization to the following
@Html.DropDownListFor(x => x.Members[i].OccupationCd,
new SelectList(
(IEnumerable<Occupation>)ViewData["ddl_occupation"],
"OccupationCd",
"@@HERE YOU ADD THE PROPERTY YOU WANT TO VISUALIZE@@",
Model.Members[i].OccupationCd),
"---Select Occupation--",
new { @style = "width:100px", @class = "Occupation required" })
This should fix your problem.