string sqlSignal="";

               string ClickedNode = FileTree.SelectedNode.Text.ToString();

               string FaNode = FileTree.SelectedNode.Parent.Text.ToString();

               string strSQL = "SELECT UPT FROM CfgEquipment Where 所属站=" + "'" + FaNode + "'" + "and 设备名称=" + "'" + ClickedNode + "'";

               OleDbConnection conn = new OleDbConnection();

               OleDbDataReader reader = null;

               conn = new OleDbConnection(strConnection);

               conn.Open();

               OleDbCommand command = conn.CreateCommand();

               command.CommandText = strSQL;

               reader = command.ExecuteReader();

               while (reader.Read())

               {

                   string strUPT = reader.GetInt32(0).ToString();

                   sqlSignal = "SELECT 信号名称 FROM CfgSignal Where UPT=" + "'" + strUPT + "'";

               }

               reader.Close();

               OleDbDataReader readerSignals = null;

               OleDbCommand commandSignals = conn.CreateCommand();

               commandSignals.CommandText = sqlSignal;

               MessageBoxEx.Show(sqlSignal);

               readerSignals = commandSignals.ExecuteReader();

               while (readerSignals.Read())

               {

                   String signals = readerSignals.GetString(0);

                   MessageBoxEx.Show(signals);

             &