ASP.NET Dynamic Data, custom fields render

using System;
using System.Web.DynamicData;
using System.ComponentModel.DataAnnotations;


[MetadataType(typeof(ProductMetaData))]
public partial class Product
{

}

public class ProductMetaData
{

    // Applying DisplayFormatAttribute
    // Display the text [Null] when the data field is empty.
    // Also, convert empty string to null for storing.
    [DisplayFormat(ConvertEmptyStringToNull = true, NullDisplayText = "[Null]")]
    public object Size;

    // Display currency data field in the format $1,345.50.
    [DisplayFormat(DataFormatString="{0:C}")]
    public object StandardCost;

    // Display date data field in the short format 11/12/08.
    // Also, apply format in edit mode.
    [DisplayFormat(ApplyFormatInEditMode=true, DataFormatString = "{0:d}")]
    public object SellStartDate;
}

details:

DisplayFormatAttribute Class