SharePoint 2010 yes/no value Eventreciver

I want to run a check to yes/no "Order" column while items adding/added.

But i can not catch the right property  while testing/debugging. any one help  me? anyone know how can i check yes/no value while item adding/added?

public override void ItemAdding(SPItemEventProperties properties)
        {
            base.ItemAdding(properties);
                SPListItem CurrentItem = properties.ListItem;
                string Order = CurrentItem["Order"].ToString();
                string Ovalue = "Yes";

if (order == Ovalue)

Rizwan Ahmed