你正在创建一个Web窗体。你写了如下的代码段去创建一个 SqlCommand对象:<img src="https://nimg.ppkao.com/2018-07/longzhengxuan/2018072715221299244.jpg?sign=604a92e7c3ed3874febf5c8fb1ec250f&t=62d509bd" /><br /> <br /> 现在,你需要显示Customers表中客户的数量。下面那两个代码段能达到此目的?()
A、object customerCount = cmd.ExecuteScalar(); lblCompanyName.Text =customerCount.ToString();
B、int customerCount = cmd.ExecuteNonQuery(); lblCompanyName.Text =customerCount.ToString();
C、SqlDataReader dr = cmd.ExecuteReader(); dr.Read(); lblCompanyName.Text =dr[0].ToString();
D、SqlDataReader dr = cmd.ExecuteReader(); dr.Read(); lblCompanyName.Text = dr.ToString();