在datagrid中实现批量删除时出现：未将对象引用设置到对象的实例
弄了一个通宵还是没搞好
以下是代码，当我点checkbox并点击删除按钮的时候。出现错误提示：未将对象引用设置到对象的实例
以下是代码
CS：
using System;using System.Collections;using System.ComponentModel;using System.Data;using System.Drawing;using System.Web;using System.Web.SessionState;using System.Web.UI;using System.Web.UI.WebControls;using System.Web.UI.HtmlControls;namespace CHINAESL.News{ /// <summary> /// Manage 的摘要说明。 /// </summary> public partial class Manage : System.Web.UI.Page { public DataSet ds=new DataSet ();//将DataSet实例化 protected void Page_Load(object sender, System.EventArgs e) { if(Session["UserName"].ToString().Equals("worldlink")) { ds = Socut.Data.ExecuteDataSet("SELECT * FROM socut_news ORDER BY n_time DESC","TableName"); DataGrid1.DataSource =ds;//设置数据源 DataGrid1.DataBind ();//绑定数据 } else { Response.Write("<script language=javascript>alert('此页面无效，请返回！')</script>"); Response.Write("<script language=javascript>window.location.href='/CHINAESL/default.aspx'</script>"); } } #region Web 窗体设计器生成的代码 override protected void OnInit(EventArgs e) { // // CODEGEN: 该调用是 ASP.NET Web 窗体设计器所必需的。 // InitializeComponent(); base.OnInit(e); } /// <summary> /// 设计器支持所需的方法 - 不要使用代码编辑器修改 /// 此方法的内容。 /// </summary> private void InitializeComponent() { this.DataGrid1.PageIndexChanged += new System.Web.UI.WebControls.DataGridPageChangedEventHandler(this.DataGrid1_PageIndexChanged); } #endregion private void DataGrid1_PageIndexChanged(object source, System.Web.UI.WebControls.DataGridPageChangedEventArgs e) { DataGrid1.CurrentPageIndex = e.NewPageIndex; DataBind(); } protected void LinkButton1_OnClick(object sender, EventArgs e) { { for (int i = 0; i < DataGrid1.Items.Count; i++) { CheckBox mychk = (CheckBox)DataGrid1.Items[i].FindControl("Item"); if (mychk.Checked == true) { string myid = Request.Form["Item"]; Socut.Data.ExecuteDataSet("DELETE FROM socut_news WHERE n_id='" + myid + "'"); } } } }}}<%@ Page language="c#" Inherits="CHINAESL.News.Manage" CodeFile="Manage.aspx.cs" %><!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN" ><HTML> <HEAD> <title>Manage</title> <meta name="GENERATOR" Content="Microsoft Visual Studio .NET 7.1"> <meta name="CODE_LANGUAGE" Content="C#"> <meta name="vs_defaultClientScript" content="JavaScript"> <meta name="vs_targetSchema" content="http://schemas.microsoft.com/intellisense/ie5"> </HEAD><script type="text/javascript"> function SelectAll(tempControl) { var theBox=tempControl; xState=theBox.checked; elem=theBox.form.elements; for(i=0;i<elem.length;i++) { if(elem[i].type=="checkbox" && elem[i].id!=theBox.id) { if(elem[i].checked!=xState) { elem[i].click(); } } } }</script> <body> <form id="Form1" method="post" runat="server"> <table cellSpacing="1" cellPadding="5" width="780" align="center" bgColor="#cccccc" border="0"> <tr> <td align="center" width="788" bgColor="#ffffff" height="150">网站顶部</td> </tr> </table> <table cellSpacing="1" cellPadding="5" width="780" align="center" bgColor="#cccccc" border="0"> <tr bgColor="#ffffff"> <td width="177" height="200" style="WIDTH: 177px"><FONT face="宋体"> <P><BR> </FONT><FONT face="宋体"></FONT> </td> <td vAlign="top" rowSpan="2"><asp:datagrid id="DataGrid1" runat="server" AutoGenerateColumns="False" Height="120px" Width="575px" PageSize="15" AllowPaging="True"> <Columns> <asp:TemplateColumn HeaderText="求职信息:"> <ItemTemplate> <input name="Item" type="checkbox" value=<%#DataBinder.Eval(Container.DataItem,"n_id")%>> <a href='edit.aspx?id=<%#DataBinder.Eval(Container.DataItem,"n_id")%>' target=""> 编辑</a>·<a href='view.aspx?id=<%#DataBinder.Eval(Container.DataItem,"n_id")%>' target=_blank><%#DataBinder.Eval(Container.DataItem, "n_title")%></a> </ItemTemplate> </asp:TemplateColumn> </Columns> <PagerStyle Font-Size="X-Small" Font-Names="Tahoma" HorizontalAlign="Center" ForeColor="#333399" BackColor="#66FF99" Mode="NumericPages"></PagerStyle> </asp:datagrid> <input id="checkall" type="checkbox" Onclick="javascript:SelectAll(this);" name="allcheck"/> <asp:LinkButton ID="LinkButton1" runat="server" OnClick="LinkButton1_OnClick">DelSelected</asp:LinkButton></td> </tr> <tr bgColor="#ffffff"> <td height="200" style="WIDTH: 179px">文章统计</td> </tr> </table> <table cellSpacing="1" cellPadding="5" width="780" align="center" bgColor="#cccccc" border="0"> <tr> <td align="center" width="788" bgColor="#ffffff" height="150">网站底部</td> </tr> </table> </form> </body></HTML>