MVC5: DropdownlistFor: How to handle empty data
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Hi, I created dropdownlist in my view and controller as below. If ViewBag.CategoryList is null, it is throwing exception. how to handle the exception. Please guide me. Thank you.
@Html.DropDownListFor(m => m.Category, (IEnumerable<SelectListItem>)ViewBag.CategoryList)
Code is:
DataTable dt = registrationDAO.GetParameters("PSTND");
List<SelectListItem> positions = new List<SelectListItem>();
foreach (DataRow dr in dt.Rows)
{
positions.Add(new SelectListItem { Text = dr["PARAM_VALUE"].ToString() });
}
ViewBag.CategoryList = positions;