string connectionstring="server=(local);database=School;Intergrated Scurity=true";Sqlconnection con=new Sqlconnection(connectionstring);Sqlcommandcom1=new Sqlcommand("select num from test1",con);Sqlcommandcom2=new Sqlcommand("select num from test2",con);Sqlcommandcom3=new Sqlcommand("select num from test3",con);i...
