请问一下.net中DataReader如何嵌套？

while (sdr.Read())
{

storeid = sdr[0].ToString();
Storepi = sdr[1].ToString();
mobileinfoid = sdr[2].ToString();
MobileModel = sdr[3].ToString();


sdrAccessory = AccessoryStoreCmd.ExecuteReader();
while (sdrAccessory.Read())
{
AccessoryName += sdr[0];
AccessoryName += " ";
AccessoryName += sdr[1];
AccessoryName += " ";
}

｝

[解决办法]
这样做会占用两个Connection，lz三思
[解决办法]
先用dataset