C#数据绑定

Question

             BindingSource bs = new BindingSource(_bindingSource,"Sex");
            cboSex.Format += new ListControlConvertEventHandler(cboSex_Format);            cboSex.DataBindings.Add("SelectedIndex", bs, "Sex");        private void cboSex_Format(object sender, ListControlConvertEventArgs e)
        {
           // MessageBox.Show(e.Value.ToString());
            if(e.DesiredType == typeof(int))
            {
                if (e.Value == DBNull.Value)
                    e.Value = 0;
                else 
                {
                    if ((bool)e.Value == true)
                        e.Value = 1;
                    else
                        e.Value = 2;
                }
            }
        }报错了，不能绑定数据.. 
谁能告诉我 .. 谢谢了..

Answer 1

红色的代码那..个sex不能绑定 e.DesiredType 点解是string 类型的

Answer 2

e.DesiredType == typeof(int)
e.DesiredType 是string类型的.. 我要的是int类型啊.. 请问点解
我在上面有挂事件的..