Question

I have this code

@Html.RadioButtonFor(model => model.LivStato, 1, Model.LivStato == 1)
@Html.RadioButtonFor(model => model.LivStato, -1, Convert.ToString(Model.LivStato) == string.Empty)

If Model.LivStato == 1 is true, the radio button is checked.

I don’t understand why if Convert.ToString(Model.LivStato) == string.Empty is true, the radio button is not checked

I also try this

@Html.RadioButtonFor(model => model.LivStato, -1, !Model.LivStato.HasValue)

but don’t work.

In the model:

public short? LivStato { get; set; }

Can anyone help me?

Answer 1

Look at HtmlHelper.RadioButtonFor overloads : no one uses a boolean third parameter as “check button if value == something”. Third parameter (when it exists) is just here for htmlAttributes.

http://msdn.microsoft.com/en-us/library/ee830415%28v=vs.108%29

If your firstLine works, it’s just because you use 1 as second parameter (Model.LivStato == 1 doesn’t do anything).

You may try (untested)

@Html.RadioButtonFor(model => model.LivStato, 1)
@Html.RadioButtonFor(model => model.LivStato, -1)

and change -1 to null in your controller.