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asp.net DBHelp.cs

 
 public class DBHelper
    {
        private static SqlConnection connection;
        public static SqlConnection Connection
        {
            get
            {
                string connectionString = ConfigurationManager.ConnectionStrings["MyCommerce"].ConnectionString;
                if (connection == null)
                {
                    connection = new SqlConnection(connectionString);
                    connection.Open();
                }
                else if (connection.State == System.Data.ConnectionState.Closed)
                {
                    connection.Open();
                }
                else if (connection.State == System.Data.ConnectionState.Broken)
                {
          


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using System;
using System.Web;
using System.Data.SqlClient;
using System.Data;
using System.Configuration;
namespace op_db
{
/**//// <summary>
/// ×¨ÃÅÓÃÀ´´¦ÀíÓëÊý¾Ý¿âµÄ²Ù×÷
/// </summary>
    public class&n ......
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