A.dsOrder["order"].Rows[0][0] B.dsOrder.Tables[0].Rows[0][0] C.dsOrder.Tables[0].Columns[0][0] D.dsOrder["order"].Columns[0][0]
A.using(SqlConnection conn=newSqlConnection(connString)){} B.using(){SqlConnection conn=newSqlConnection(connString)} C.SqlConnection conn=newSqlConnection(connString)using(){} D.using(){}SqlConnection conn=newSqlConnection(connString)
下列關(guān)于ADO.NET的特點(diǎn)錯(cuò)誤的是()。
A.A B.B C.C D.D