当状态值等于0或者online=2时怎么加载不了图片啊！

  foreach (TreeNode node in tnc)
        {
            if (node.ChildNodes.Count != 0)
            {
                GetAllNodeText(node.ChildNodes);
                SqlCommand com = new SqlCommand();
                com.Connection = con;
                string sqlQuery = "select name from MonitorInfo where status = 0 or online =2";
                SqlDataAdapter Adp = new SqlDataAdapter(sqlQuery, con);
                DataSet dts = new DataSet();
                Adp.Fill(dts, "MonitorInfo");
                string meterName;
                for (int i = 0; i < dts.Tables[0].Rows.Count; i++)
                {
                    meterName = dts.Tables[0].Rows[i]["name"].ToString();
                    if (meterName == node.Text)
                    {
                        node.ImageUrl = "Images/left2.gif";
                    }
                    else
                    {
                        switch (node.Depth)
                        {
                            case 0:
                                node.ImageUrl = "Images/icon/base.gif"; //~/Images/icon/base.gif
                                break;
                            case 1:
                                node.ImageUrl = "Images/icon/folder.gif";
                                break;
                            case 2:
                                node.ImageUrl = "Images/right.gif";
                                break;
                            default:
                                node.ImageUrl = "Images/right.gif";
                                break;
                        }
                    }
                }
            }
            switch (node.Depth)
            {
                case 0:
                    node.ImageUrl = "Images/icon/base.gif"; //~/Images/icon/base.gif
                    break;
                case 1:
                    node.ImageUrl = "Images/icon/folder.gif";
                    break;
                case 2:
                    node.ImageUrl = "Images/right.gif";
                    break;
                default:
                    node.ImageUrl = "Images/right.gif";
                    break;
            }