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Editorial Team
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Asked: 2026-05-13T16:09:25+00:00

I currently have no validation for my drop down list, but nevertheless, I get

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I currently have no validation for my drop down list, but nevertheless, I get a validation error in my ModelState when no value is selected.

Is there any automated validation when you specify a default option?

It isn’t part of the Model, so it definitely isn’t a missed attribute!

<%= Html.DropDownList("CategoryId", 
    (IEnumerable<SelectListItem>)ViewData["categories"], "-- Select --")%>
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1 Answer

  1. Editorial Team

    I didn’t get any suggestions on this one – but if you’ve arrived here looking for an answer, this is how I solved my issue:

    Instead of passing in the default value to the DropDownList, I initialize the category list with a default instead (i.e. you put { “[YourDefaultValue]”, “– Select –” } as the first SelectListItem).

    <%= Html.DropDownList("CategoryId", 
    (IEnumerable<SelectListItem>)ViewData["categories"])%>
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