DataSet通过web service返回xml，两个table能不能嵌套？
如下代码所示：
------------------------------
//该web   service的方法返回一个XmlDataDocument对象
public   XmlDataDocument   TDBinding(string   strHostcustid/*用户输入客户号*/)
{
DataSet   ds     =   new   DataSet();
XmlDataDocument   xd;
DataColumn   parentCol;
DataColumn   childCol;
//通过ODBC访问数据库的两个表，一个是主表，一个是明细表
OdbcConnection   con   =   new   OdbcConnection( "DSN=137 ");
OdbcDataAdapter   daCust   =   new   OdbcDataAdapter( "select   *   from   PData1.T01_PARTY   where   Host_Cust_Id= ' "+strHostcustid   +   " ' ",con);  
OdbcDataAdapter   daEvnt   =   new   OdbcDataAdapter( "select   *   from   PData1.t05_financial_event_hm   where   Host_Cust_Id= ' "+strHostcustid   +   " ' ",con);
//查询后将两个结果集放入到dataset中,并返回
daCust.Fill(ds, "Customer ");
daEvnt.Fill(ds, "Event ");
xd   =   new   XmlDataDocument(ds);
return   xd;
}
这个方法返回的xml格式如下:
<NewDataSet>
<Customer>
......
</Customer>
<Event>
......
</Event>
<Event>
......
</Event>
<Event>
......
</Event>
</NewDataSet>
因为一个Customer会有多个event，这样看起来很长，我希望上面的xml能不能调整成如下格式，就是把event这个结果集再向里缩进一层：
<NewDataSet>
<Customer>
......
</Customer>
<CustomerEvent>
<Event>
......
</Event>
<Event>
......
</Event>
</CustomerEvent>
</NewDataSet>

谢谢。

------解决方案--------------------
DataCollumn [] parent = new DataCollumn[1];
DataCollumn [] child = new DataCollumn[1];
parent[0] = ds.Tables( "Customer ").Columns( "Host_Cust_Id ")
child[1] = ds.Tables( "Event ").Columns( "Host_Cust_Id ")

// Create DataRelation.
DataRelation CustEventRel= New DataRelation( "CustomersEvent ", parentCols, childCols, true)
// set the event as the child element of the parent Customer
CustEventRel.Nested = true;
// Add the relation to the DataSet.
ds.Relations.Add(CustEventRel);