ASP.NET MVC Html.RadioButton Exception

Question

I haver a simple radio button list on my page that I render with the following in my view:

Gender
<%=         


        

Answer 1

You might want to try changing gender to a string (M/F) instead of an int and see if that works.

If you absolutely must have it as an int, you could always translate on the back end.

private int? gender { get; set; }
public string displayGender
{
    get
    {
        return this.gender.HasValue
                 ? (this.gender.Value == 1 ? "M" : "F" )
                 : null;
    }
    set
    {
        this.gender = null;
        if (value == "M")
           this.gender = 1;
        else if (value == "F")
           this.gender = 2;
    }
}

Gender
<%= Html.RadioButton("displayGender", "M") %> Male
<%= Html.RadioButton("displayGender", "F") %> Female
<%= Html.ValidationMessage("displayGender") %>

Base on your comment, you may want to add:

<%= Html.RadioButton("displayGender",
                     string.Empty,
                     true, // this is the default
                     new { @style = "display: none;" } ) %>

This will ensure that displayGender gets posted back (there will always be a chosen radio) and I think the value will be string.Empty instead of a null reference. If this works, you may want to try switching back to the nullable int.