Answer / neha

In invoke queries by using sqlcommand object
present in system.data.sqlclient

Answer / chitaranjan mallick

first which type of querry u want to excute like
oracle,sql,oledb etc. then add the namespace like
system.data.oracleclient(or)system.data.sqlclient(or)system.data.oledb
etc and then create the object of database which u want to
connect..

Answer / krishna prasad

using system.sqlclient or which ever classes you like
by using these classes one can connect to the databases
and invoke or execute queries

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