Create an EPiServer Commerce Metafield programmatically and add it to a Metaclass in Business Foundation

AddMetaClass.cs

/// <summary>
/// Programmatically create a new MetaField on the Contact MetaClass <seealso href="http://world.episerver.com/documentation/Items/Developers-Guide/EPiServer-Commerce/8/Business-Foundation/Business-Meta-Model/MetaField-class/"/>
/// </summary>
private void setupMetaField()
{
    MetaClassManager metaModel = DataContext.Current.MetaModel;
    foreach (MetaClass mc in metaModel.MetaClasses)
    {
        if (mc.Name == "Contact")
        {
            //Delete if needed
            //mc.DeleteMetaField(mc.Fields["DOB"]);

            string fieldName = "DOB";
            if (mc.Fields[fieldName] == null)
            {
                AttributeCollection attr = new AttributeCollection();
                MetaField newMetafield = mc.CreateMetaField(
                    fieldName, 
                    "Date of Birth", 
                    MetaFieldType.Date, 
                    true, 
                    string.Empty, 
                    attr);
            }

            break;
        }
    }
}