有关GRIDVIW控件中分页后选折CHECKBOX控件问题

        <script type="text/javascript">
    function selectAll(obj)
    {  
       //alert(document.getElementById("GridView1").rows.length);
       var state;
       if(obj.checked==true)
          state = true;
       else
          state = false;
       for (var i =2; i < document.getElementById("GridView1").rows.length+4; i++) 
       {    
            if(i>=10)
                document.getElementById("GridView1_ctl"+i+"_CheckBox1").checked=state;
            else
                document.getElementById("GridView1_ctl0"+i+"_CheckBox1").checked=state;
       }              
    }    </script>分页后为什么选完后上传被选不执行呢?
就是选中了但是上传他怎么是没选中的状态为什么        int intCount = this.GridView1.Rows.Count;
        for (int i = 0; i < intCount; i++)
        {
            CheckBox CheckBox1 = this.GridView1.Rows[i].Cells[5].FindControl("CheckBox1") as CheckBox;
            if (CheckBox1.Checked)
            {
                //string title =this.GridView1.Rows[i].Cells[1].Text;
                string title = CheckBox1.Checked.ToString();
               // string id = GridView1.Rows[i].Cells[0].Text;
                Label id = (Label) GridView1.Rows[i].Cells[1].FindControl("label1");//
                string sqlcontent = "UPDATE Tips SET Release ='" + title + "' where Title='" + id.Text +"'";
                try
                {
                    SqlCommand cmd = new SqlCommand(sqlcontent,OffFactory.db.WebCreatecon());
                    SqlCommand cmd1 = new SqlCommand(sqlcontent, OffFactory.db.GadgetCreatecon());
                    cmd.ExecuteNonQuery();
                    cmd1.ExecuteNonQuery();
                }
                catch
                {
                    Response.Write("<script language='javascript'>alert('操作失败!')</script>");
                    Response.Write("<script language='javascript'>window.location.href='Default.aspx'</script>");
                }
            }
            else
            {
                //string title = CheckBox1.Checked.ToString();
                string title = CheckBox1.Checked.ToString();
                //string id = GridView1.Rows[i].Cells[0].Text;
                Label id = (Label)GridView1.Rows[i].Cells[1].FindControl("label1");
                string sid = id.Text;
                string sqlcontent = "UPDATE Tips SET Release ='" + title + "' where Title='" + sid + "'";
                try
                {
                    SqlCommand cmd = new SqlCommand(sqlcontent, OffFactory.db.WebCreatecon());
                    SqlCommand cmd1 = new SqlCommand(sqlcontent, OffFactory.db.GadgetCreatecon());
                    cmd.ExecuteNonQuery();
                    cmd1.ExecuteNonQuery();
                }
                catch 
                {
                    Response.Write("<script language='javascript'>alert('操作失败!')</script>");
                    Response.Write("<script language='javascript'>window.location.href='Default.aspx'</script>");
                }
            }
        }
        Response.Write("<script language='javascript'>alert('发布成功')</script>");
        Response.Write("<script language='javascript'>window.location.href='Default.aspx'</script>");