ASP.net MVC2 validation for my Dropdown list boxes?

Question

Can anyone give me a nice link to Implement ASP.NET MVC2 validation for my dropdownlist in my view?

My Dropdownlist in my view is something like this:

<%: Html.DropDownListFor(model => model.SelectedStudent, 
                         new SelectList(Model.StudentIDs, "ID", "Name"),
                         "Please select..", 
                         new { id="Student", style = "width:190px;" })%>

and my validation message is:

  <%:Html.ValidationMessageFor(model => model.SelectedStudent) %>

in my Model I have this validation:

[DisplayName("Student")]
[Required(ErrorMessage="Please Select StudentID.")]
public int Student{ get; set; }

But somehow it's not validating and I am not seeing validation message in my view.

Something causing problem with "Please select"? or please correct me if I am wrong..

Thanks

Chuck Callebs · Accepted Answer · 2010-11-22 21:42:34Z

3

In your view, you'll want to put something like this:

<%= Html.ValidationMessageFor(model => model.DropDownListReference) %>

In your model, something like this

public class Whatever
{
    [Required(ErrorMessage = "Please select a Whatever!")]
    [DisplayFormat(ConvertEmptyStringToNull = false)]
    public int DropDownListReference { get; set; }
}

This is assuming that you just want to validate that they've selected something.

edited Nov 22, 2010 at 21:42

answered Nov 22, 2010 at 19:27

Chuck Callebs

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9 Comments

kumar Over a year ago

Thanks TreFrog, Do I need to use EnableClientValidation in my view?

Chuck Callebs Over a year ago

If you want the validation to happen via Javascript, yeah. But this way will just render the page if they type in something wrong.

kumar Over a year ago

Yes I validated with Javascript its working fine for me.. but I want to try with MVC2 validation.. why its behaving like this.. if my Dropdown list box has Please select its throwing '' value not null value.. is this causing problem?

Chuck Callebs Over a year ago

I changed my example above to better fit what you're talking about. Make sure that the "Please select" option has a value of 0.

kumar Over a year ago

but now I am getting Please select value is '' allways.. how to give the Value as 0 in my dropdownlistfor code?

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