如何在与数据库绑定后在下拉列表中添加默认值

如何在绑定值之上添加默认文本

how can I add a default text on top of the binded values

DropDownList ddlSize = (DropDownList)FormView_Product.Row.Cells[0].FindControl("ddlSize");
    CommerceEntities db = new CommerceEntities();

    ddlColor.DataSource = from p in db.ProductTypes
                                      where p.ProductID == pID
                                      orderby p.Color 
                                      select new { p.Color };
    ddlColor.DataTextField = "Color";