C# ACCESS 多表查询填充DATASET问题

SQL语句如下
SELECT dbo_Operate.OperateName, dbo_Operate.OperateID, dbo_Operate.OperateClass
FROM ((dbo_Operate dbo_Operate INNER JOIN
dbo_OperateRights ON dbo_Operate.OperateID = dbo_OperateRights.OperateId AND
dbo_Operate.OperateID = dbo_OperateRights.OperateId) INNER JOIN
dbo_Operator ON dbo_OperateRights.OperatorId = dbo_Operator.OperatorID)
WHERE (dbo_OperateRights.OperatorId = ?)

把问号换为某个ID值就可以在查询分析器中得到正确的结果。但是当我用这个SQL语句填充DATASET后，编译器报错，说是DATASET为空。代码如下：
OleDbConnection con = new OleDbConnection("Provider=Microsoft.Jet.OLEDB.4.0;Data Source=HouseDB.mdb");
DataSet MySet = new DataSet();
OleDbDataAdapter MyAdapter = new OleDbDataAdapter(Query, con);
MyAdapter.Fill(MySet, TableName);
以上代码在进行单表查询时时正确的，排除了连接字符串和逻辑错误。
请各位高手帮帮忙~~~~~~
我做的是winform程序

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