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解决办法

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：

C# code

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 + "'");
                    }
                }

            }
        }
}
}

aspx：

HTML code

<%@ 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>&nbsp;
                    </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>

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解决办法

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