错误说"；缺少右括号"；在我的SQL语句中..但它'；s不是！帮助

这是我的C#程序中的语句：

(由gbn编辑，为清晰起见格式化，因此不在一行上所有(

DbCommand.CommandText =
             @"SELECT 
      HIST.MBRSEP, HIST.LOCATION, HIST.BILLTYPE, HIST.BILLMOYR, LOCINFO.CYCLE, 
      LOCINFO.DIST, LOCINFO.LOCATION
    FROM 
      (CAV_MBRHISTDEL AS HIST INNER JOIN CAV_LOCINFODETL AS LOCINFO ON HIST.LOCATION = LOCINFO.LOCATION)
    WHERE
       LOCINFO.CYCLE = @CYCLE AND 
       LOCINFO.DIST = @DISTRICT AND 
       HIST.BILLTYPE = '09' AND 
       HIST.BILLMOYR <> '9999'";

这是错误消息：

错误[HY000][Oracle][ODBC][Ora]Ora-00907：缺少右括号

在我的SQL语句中只有两个括号，一个右括号和一个左括号。我不知道这个错误告诉我什么。有什么建议吗？

编辑：以下是参数的定义方式：

        string cycle = cbCycle.Text;
        string district = cbDistrict.Text.Substring(0,2);

这里是我将它们添加到DbCommand:的地方

        DbCommand.Parameters.AddWithValue("@CYCLE", cycle);
        DbCommand.Parameters.AddWithValue("@DISTRICT", district);

以下是我的完整代码，当有人点击我表单上的"Go"按钮时会触发：

private void btnGo_Click(object sender, EventArgs e)
    {
        //get parameters
        string cycle = cbCycle.Text;
        string district = cbDistrict.Text.Substring(0,2);
        //create a connection to the database
        OdbcConnection DbConnection = new OdbcConnection("DSN=UPN2;uid=xxx;pwd=xxxx");
        DbConnection.Open();
        //create a command to extract the required data and
        //assign it to the connection string
        OdbcCommand DbCommand = DbConnection.CreateCommand();
        DbCommand.CommandText =
             @"SELECT HIST.MBRSEP, HIST.LOCATION, HIST.BILLTYPE, HIST.BILLMOYR, LOCINFO.CYCLE, LOCINFO.DIST, LOCINFO.LOCATION FROM CAV_MBRHISTDEL AS HIST INNER JOIN CAV_LOCINFODETL AS LOCINFO ON HIST.LOCATION = LOCINFO.LOCATION WHERE LOCINFO.CYCLE = @CYCLE AND LOCINFO.DIST = @DISTRICT AND HIST.BILLTYPE = '09' AND HIST.BILLMOYR <> '9999'; ";
        DbCommand.Parameters.AddWithValue("@CYCLE", cycle);
        DbCommand.Parameters.AddWithValue("@DISTRICT", district);
        //Create a DataAdapter to run the command and fill the datatable
        OdbcDataAdapter da = new OdbcDataAdapter();
        da.SelectCommand = DbCommand;
        DataTable dt = new DataTable();
        da.Fill(dt);

        tbOutput.Text = PrintDataTable(dt);
        DbCommand.Dispose();
        DbConnection.Close();
    }