html xmlns="http://www.w3.org/1999/xhtml">
 head runat="server">
     title>DataList控件删除操作（支持批量删除）/title>
     script type="text/javascript">
         function CheckAll(Obj) {
             var AllObj = document.all;
             if (Obj.checked)//全选
             {
                 for (var i = 0; i AllObj.length; i++) {
                     if (AllObj[i].type == "checkbox") {
                         AllObj[i].checked = true;
                     }
                 }
             }
             else//反选
             {
                 for (var i = 0; i AllObj.length; i++) {
                     if (AllObj[i].type == "checkbox") {
                         AllObj[i].checked = false;
                     }
                 }
             }
         }

     /script>
 /head>
 body>
     form id="form1" runat="server">
     div>
     fieldset style="text-align: center; width: 540px;">
     legend style=" text-align:center; ">使用Datalist删除数据（支持批量删除）/legend>

        asp:DataList ID="DataList1" runat="server"
             onitemcommand="DataList1_ItemCommand" DataKeyField="id">
        HeaderTemplate>
        div style="text-align:center">
        table border = "1" cellpadding="0" cellspacing="0"  style=" font-size:12; width:500px"  >
         tr>
             td style="width:100px">全选/反选input id="Checkbox1" type="checkbox" name="全选" value="全选" onclick="return CheckAll(this)" title="全选" />/td>
             td style="width:100px">用户编号/td>
             td style="width:100px">用户昵称/td>
             td style="width:100px">个性签名/td>
             td style="width:100px">删除/td>
         /tr>
        /table>
        /div>
        /HeaderTemplate>

            ItemTemplate>
            div style="text-align:center">
            table border = "1" cellpadding="0" cellspacing="0"  style=" font-size:12; width:500px"  >
                 tr>
                 td style="width:100px"> asp:CheckBox ID="CheckBox2" runat="server" />/td>
                 td style="width:100px">asp:Label ID="Label1" runat="server" Text='%# Eval("id") %>'>/asp:Label>/td>
                 td style="width:100px">asp:Label ID="Label2" runat="server" Text='%# Eval("bg_name") %>'>/asp:Label>/td>
                 td style="width:100px">asp:Label ID="Label3" runat="server" Text='%# Eval("bg_p_autograph") %>'>/asp:Label>/td>
                 td style="width:100px">asp:Button ID="btnDelete" runat="server" Text="删除"  CommandName="delete"
                        BorderStyle="None" onclientclick="return confirm(quot;确认删除？quot;);" />/td>%--请注意此处的CommandName命令--%>
                /tr>
             /table>
             /div>
            /ItemTemplate>
            FooterTemplate>
                 div style="text-align:center">
                     table border="1" cellpadding="0" cellspacing="0" style="font-size:12px; width:100%">
                         tr>
                         td style="width:100%; text-align:center">
                             asp:Button ID="btnPLDelete" runat="server" Text="批量删除"  CommandName="pldelete"
                                  BorderStyle="None" onclientclick="return confirm(quot;确认删除？quot;);"  />/td>
                         /tr>
                     /table>
                 /div>
            /FooterTemplate>
        /asp:DataList>
        /fieldset>
     /div>
     /form>
 /body>
 /html>

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Data;
using System.Data.SqlClient;
using System.Configuration;

public partial class _Default : System.Web.UI.Page
{

    ////得到Web.config 中的连接放在变量中
    SqlConnection con = new SqlConnection(ConfigurationManager.ConnectionStrings["connStr"].ConnectionString);
    protected void Page_Load(object sender, EventArgs e)
    {
        if (!IsPostBack)
        {
           //调用自定义方法绑定数据到控件（为以后做MVC打下基础）
            BindDataList();
        }
    }
    //对datelist进行数据绑定
    private void BindDataList()
    {

       
        //定义查询语句,这里最好将SQL语句在SQL中写好并验证正确确在复制粘贴过来（在对数据查询时最好只查所需的一些不需要的数据就不要取出，这样可以提高运行的效率）
        string strSql = "SELECT * FROM bg_spatial";//定义一条SQL语句
        SqlDataAdapter sda = new SqlDataAdapter(strSql, con);
        DataSet ds = new DataSet();
        sda.Fill(ds);//把执行得到的数据放在数据集中
        DataList1.DataSource = ds;
        DataList1.DataBind();

    }

    protected void DataList1_ItemCommand(object source, DataListCommandEventArgs e)
    {
        switch (e.CommandName)
        {
            //单条数据删除操作
            case "delete":
                //取得当前Datalist控件列
                int id = int.Parse(DataList1.DataKeys[e.Item.ItemIndex].ToString());
                string strSQL = "delete from bg_spatial where id='" + id + "'";
                if (con.State.Equals(ConnectionState.Closed))
                {
                    con.Open();//打开数据库
                }
                SqlCommand cmd = new SqlCommand(strSQL, con);
                if (Convert.ToInt32(cmd.ExecuteNonQuery())>0)
                {
                    Response.Write("script>alert('删除成功！')/script>");
                    BindDataList();
                }
                else
                {
                    Response.Write("script>alert('删除失败！请查找原因')/script>");
                }
                con.Close();//关闭连接
                break;
            //批量数据删除操作
            case "pldelete":
                if (con.State.Equals(ConnectionState.Closed))
                {
                    con.Open();//打开数据库
                }
                DataListItemCollection dlic = DataList1.Items;//创建一个DataList列表项集合对象
                //执行一个循环删除所选中的信息
                for (int i = 0; i dlic.Count; i++)
                {
                    if (dlic[i].ItemType == ListItemType.AlternatingItem||dlic[i].ItemType == ListItemType.Item)
                    {
                         CheckBox cbox = (CheckBox)dlic[i].FindControl("CheckBox2");
                         if (cbox.Checked)
                        {
                            int p_id = int.Parse(DataList1.DataKeys[dlic[i].ItemIndex].ToString());
                            SqlCommand p_cmd = new SqlCommand("delete from bg_spatial where id=" + p_id , con);
                            p_cmd.ExecuteNonQuery();
                        }
                    }

                }
                con.Close();
                BindDataList();
                break;
        }
    }
}