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fetching data from datareader

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Hello,

Can anyone please tell me how to fetch 5000 records using Oracledatareader.

we tried with following code.but nothing is returning.

oraclecommand cmd=new oraclecommand("query" ,con)

oracledatareader dr=cmd.executereader();

while(dr.read()) //not enetering here

{

}


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