oh, God, you even tell us your password? :-), try
SqlConnection("server=210.77.151.53;database=tianyuncomcn;uid=tianyun;pwd=CNti21cMyun;");make sure account "tianyun" account uses SQL authentication mode
SqlConnection("server=210.77.151.53;database=tianyuncomcn;uid=tianyun;pwd=CNti21cMyun;");make sure account "tianyun" account uses SQL authentication mode
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