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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.HtmlControls;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Xml.Linq;
using System.Data.SqlClient;
namespace csdndemo
{
public partial class dropdownlistandGridview : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
//加载dropdownlist
if (!IsPostBack)
{
this.ddl1.Items.Add("1");
this.ddl1.Items.Add("2");
this.ddl1.Items.Add("3");
}
}
protected void ddl1_SelectedIndexChanged(object sender, EventArgs e)
{
//获取dropdownlist的选中值
string ID = this.ddl1.SelectedItem.Value;
SqlConnection cn = new SqlConnection();
cn.ConnectionString = "";
SqlCommand cmd = new SqlCommand();
cmd.Connection=cn;
//将选中值做为条件传入SQL语句中 可以优化
cmd.CommandText="select * from table name where ID='"+ID+"'";
SqlDataReader dr = null;
DataTable dt = new DataTable();
using (dr = cmd.ExecuteReader(CommandBehavior.CloseConnection))
{
//查出此ID 的所有详细信息
dt.Load();
}
//如果记录存在
if (dt.Rows.Count != 0)
{
//label赋值
this.LabelName.Text = dt.Rows[0]["数据库中Name的字段"].ToString();
}
else
{
this.LabelName.Text = "";
}
}
}
}