Asp.Net 绑定下拉框的值

方法1：下拉框列表直接绑定

方法2：cs代码实现：
（注：方法1和方法2不能同时使用，同时使用会以方法1为主，方法2无效）
protected void Page_Load(object sender, EventArgs e)
{
//绑定字符串的下拉列表
if (!IsPostBack)
{
List strList = new List();
strList.Add("Please select");
strList.Add("AAAA 1");
strList.Add("BBBB 2");
strList.Add("CCCC 3");
strList.Add("DDDD 4（不可选择）");

        ddlBox.DataSource = strList;
        ddlBox.DataBind();
    }

  //绑定自定义类的下拉列表
  if (!IsPostBack)
     {
         List<StudentInfo> myList = new List<StudentInfo>();
         myList.Add(new StudentInfo("1", "Please select"));
         myList.Add(new StudentInfo("2", "AAAA 1"));
         myList.Add(new StudentInfo("3", "BBBB 2"));
         myList.Add(new StudentInfo("4", "CCCC 3"));
         myList.Add(new StudentInfo("5", "DDDD 4（不可选择）"));
 
        ddlBox.DataTextField = "Name";
        ddlBox.DataValueField = "ID";
        ddlBox.DataSource = myList;
        ddlBox.DataBind();
    }

}

public class StudentInfo
{
private string _id;
public string ID
{
get { return _id; }
set { _id = value; }
}

  private string _name;
  public string Name
  {
      get { return _name; }
      set { _name = value; }
  }

   public StudentInfo(string id, string name)
   {
        _id = id;
        _name = name;
   }
}

protected void ddlBox_SelectedIndexChanged(object sender, EventArgs e)
{
string strSelect = ddlBox.SelectedValue;
if (ddlBox.SelectedIndex == 0)
{
Response.Write("请选择模板！");
}
}