zijieer的专栏

using (SqlConnection conn = new SqlConnection("Data Source=.; Initial Catalog=MyTest;User ID=sa;Password=zijieer")) { conn.Open(); using (SqlCommand cmd

using(...){      ........} 定义了一个范围，等范围结束以后进行资源的释放。例如：using(SqlConnection conn = new SqlConnection("Data Source=.;Initial Catalog=MyTest;User ID=sa;Password=sa")){ conn.open();