There is no ViewData item of type 'IEnumerable<SelectListItem>' that has the key country

In your action change ViewBag.countrydrop = item8 to ViewBag.country = item8;and in View write like this:

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

Actually when you write

@Html.DropDownList("country", (IEnumerable)ViewBag.country, "Select country")

Html.DropDownList("country","Select Country)

it looks in for IEnumerable<SelectListItem> in ViewBag with key country, you can also use this overload in this case:

@Html.DropDownList("country","Select country") // it will look for ViewBag.country and populates dropdown

See Working DEMO Example

If you were using DropDownListFor like this:

@Html.DropDownListFor(m => m.SelectedItemId, Model.MySelectList)

where MySelectList in the model was a property of type SelectList, this error could be thrown if the property was null.

Avoid this by simple initializing it in constructor, like this:

public MyModel()
{
    MySelectList = new SelectList(new List<string>()); // empty list of anything...
}

I know it's not the OP's case, but this might help someone like me which had the same error due to this.

Note that a select list is posted as null, hence your error complains that the viewdata property cannot be found.

Always reinitialize your select list within a POST action.

For further explanation: Persist SelectList in model on Post

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