小弟初次接触，水平很菜。现在网页上想实现一个功能，在名为addressbook的gridview中用checkbox选中一项或多项内容，然后再另一个gridview中显示出来，现在的问题是，另一个gridview可以正常显示addressbook的id号，但显示其他内容的时候，则出现“未将对象引用设置到对象的实例”的错误，我是在水平有限，烦请各位高人帮帮忙，下面是我写的代码

  
        DataTable dt = new DataTable();
        dt.Columns.Add("ID", typeof(string));
        dt.Columns.Add("IP地址", typeof(string));
        dt.Columns.Add("号码", typeof(string));
        foreach (GridViewRow item in this.addressbook.Rows)
        {
            CheckBox ckb = item.FindControl("CheckBox1") as CheckBox;
            if (ckb.Checked)
            {
               
                    LinkButton MyLinkButton = item.FindControl("LinkButton1") as LinkButton;

                    DataRow dr = dt.NewRow();
                    dr["ID"] = addressbook.DataKeys[item.RowIndex].Value.ToString();
                    dr["IP地址"] = MyLinkButton.Text;
                    dt.Rows.Add(dr);
               
            }
        }
        DataView dv = new DataView(dt);
        this.GridView1.DataSource = dv;
        GridView1.DataBind();