将自定义属性添加到类

//在我的课堂上，我有像这样的私有变量和属性.

//In my class I have private variables and properties like this.

私有字符串_itemCOde = string.Empty;
私人字串_itemName = string.Empty;

private string _itemCOde=string.Empty;
private string  _itemName=string.Empty;

公共字符串ItemCode
       {
          得到{return _itemCode; }
          设置{_itemCode = value == null? value:value.Trim();}
       }

public string ItemCode
        {
            get { return _itemCode; }
            set { _itemCode = value == null ? value : value.Trim();}
        }

公共字符串ItemName
       {
          得到{return _itemName; }
          设置{_itemName = value == null? value:value.Trim();}
       }

public string ItemName
        {
            get { return _itemName; }
            set { _itemName = value == null ? value : value.Trim();}
        }

根据该属性，我从sql表中选择数据后创建了Item对象.

According to this properties I create Item objects after selecting the data from the sql table.

现在，如果数据库表已更改并添加了一个名为cost的新列，那么我必须向该类中添加另一个属性.无需执行此操作，就无法根据数据库表添加属性.

Now, if database table altered and add a new column called cost, then I have to add another property to the class. Without doing this is there any way to add property according to the database table.