Reject dropdown placeholder when validating in ASP.NET MVC

Question

In my ASP.NET MVC4 model I have a required property:

[Required(ErrorMessage = "Select a class")]
public string ClassName { get; set; }

This is bound to a drop-down list in the Razor view:

@Html.DropDownListFor(o => o.ClassName, new SelectList(Model.ClassList))
@Html.ValidationMessageFor(model => model.ClassName)

However, I have set the first element of Model.ClassList as the placeholder string "Select one". If the user submits the form without choosing a class, it registers as valid because ClassName has a value of "Select one".

How can I make this placeholder selection invalid?

You could remove the placeholder from the Model property and put it in the helper: @Html.DropDownListFor(o => o.ClassName, new SelectList(Model.ClassList), "Select one") — Forty-Two
– Forty-Two, Commented Feb 12, 2013 at 21:43
@Forty-Two Thanks, that's worked! I didn't notice that helper overload. Please add this as an answer and I'll accept it. — James
– James, Commented Feb 12, 2013 at 22:05

Forty-Two · Accepted Answer · 2013-02-12 22:10:26Z

5

You could remove the placeholder from the Model property and put it in the helper:

@Html.DropDownListFor(o => o.ClassName, new SelectList(Model.ClassList), "Select one")

answered Feb 12, 2013 at 22:10

Forty-Two

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