using() 看到一段程序 用到 using(SqlConnection conn = new SqlConnecti

类似于
using System;
using System.Configuration;
using System.Data;
using System.Data.SqlClient;
using System.Collections;
--------------
using (SqlConnection conn = new SqlConnection(connString)) {
PrepareCommand(cmd,conn,null,cmdType,cmdText,cmdParms);
int val = cmd.ExecuteNonQuery();
cmd.Parameters.Clear();
return val;
}