Question

dropdownlist 联动 ，第二个dropdownlist的取值总是（第一个选项）怎么解决？

using System;
using System.Collections;
using System.Configuration;
using System.Data;
using System.Linq;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
using System.Xml.Linq;
using webwinscom.DAL.proClassIdTableAdapters;

namespace webwinscom.admin
{
public partial class addpro : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
if (!IsPostBack)
{

}
}
protected void DropDownList1_SelectedIndexChanged(object sender, EventArgs e)
{
string x = DropDownList1.SelectedValue;
string xx = "SELECT [Pro_name], [pro_ClassId] FROM [Pro_NameID] where pro_ClassId=" + x;

SqlDataSource2.SelectCommand = xx;
}

}
}

Answer 1

DropDownList2.databind()

Answer 2

加载五年后哦设置选中项