does not contain a definition for 'DropDownList'

Question

UPDATE:

since its my DropDownTypes is a collection so I try to pass something like this: it works but the only problem i'm having is that its selecting the default value which is whatever the index of 0 and my item.Type is the selected value

 @Html.DropDownListFor(m => item.Type, new SelectList(item.DropDownTypes.Select(x => x.Text)))

What I'm doing wrong here, I'm trying to load the dropdownlist

'System.Web.Mvc.HtmlHelper>' does not contain a definition for 'DropDownList' and the best extension method overload 'System.Web.Mvc.Html.SelectExtensions.DropDownList(System.Web.Mvc.HtmlHelper, string, System.Collections.Generic.IEnumerable, object)' has some invalid arguments

@model IEnumerable<web.Models.CollectionViewModel>
@foreach (var item in Model )
{
  <tr>
    <td>
         @Html.DropDownList(item.DropDownTypes, (IEnumerable<SelectListItem>)ViewBag.DropDownLoadRecoveryType, new { @class = "form-control" })
    </td>
  </tr>
}

Answer 1

This is how I was able to achieve a resolution, in case anybody else needs to know.

@Html.DropDownListFor(model => item.Type.Value, new SelectList(ViewBag.DropDownLoadRecoveryType,  "Value", "Text", item.Type))

Answer 2

You should consider adding the selected value of the dropdown list into another variable on your model. That way you can use it in the dropdown list as you're passing a list at present which isn't valid:

@model IEnumerable<web.Models.CollectionViewModel>
@foreach (var item in Model )
{
  <tr>
    <td>
         @Html.DropDownList(item.SelectedDropDownType, (IEnumerable<SelectListItem>)ViewBag.DropDownLoadRecoveryType, new { @class = "form-control" })
    </td>
  </tr>
}

Where item.SelectedDropDownType could be

public string SelectedDropDownType { get; set;}

Answer 3

The first argument of the DropDownList helper that you are using must be a string so make sure that item.DropDownTypes is actually a string. If it isn't you might consider calling .ToString() on it.