I have to update my contact form, to allow attachments.

My reading indicates I need to add a new property to my model, of type HttpPostedFileBase

So, I did the following

@model Ui.Models.Email
 
    @using (Html.BeginForm())
    {
        @Html.ValidationSummary(true)
 
        @Html.TextBoxFor(a => a.Attachment, new { @type = "file" })
    }

And my model

public class Email
        {
            [Display(Name = "Attach away my assuming chum")]
            public HttpPostedFileBase Attachment { get; set; }
        }

The problem I'm getting is the property is always null!

Usually, when it's a string, int or List, the binding works, but I have no idea how to get it to bind to my model.