C#数据库帮助类，包括新建数据库，删除数据库，还原数据库

using System;
using System.Collections;
using System.Collections.Specialized;
using System.Data;
using System.Data.SqlClient;
using System.Configuration;
using System.Data.Common;
using System.Collections.Generic;
namespace Maticsoft.DBUtility
{
    /// <summary>
    /// 数据访问抽象基础类
    /// </summary>
    public abstract class DbHelperSQL
    {
//        <?xml version="1.0" encoding="utf-8" ?>
//        <configuration>
//          <appSettings>
//              <!--连接主程序的字符串-->
//            <add key="connection" value="server=CONTRON-CAD9158;uid=sa;pwd=sa;database=syt"/>
//              <!---->
//            <add key="connectionzt" value="server=CONTRON-CAD9158;uid=sa;pwd=sa;database=syt_qwerthjkl"/>
//              <!--连接主SQLServer 的字符串-->
//            <add key="ConnectServer" value="server=CONTRON-CAD9158;uid=sa;pwd=sa;database=master"/>
//              <!--建立数据库的连接字符串-->
//            <add key="connInit" value="data source=CONTRON-CAD9158;user id=sa;password=sa;persist security info=false;packet size=4096"/>
//              <!--SQLServer安装目录-->
//            <add key="sqlServerData" value="C:Program FilesMicrosoft SQL ServerMSSQLData"/>
//          </appSettings>
//        </configuration>
                //数据库连接字符串(web.config来配置)，可以动态更改connectionString支持多数据库.        
                public static string connectionString = PubConstant.ConnectionString;   
                public static string connectionString = System.Configuration.ConfigurationSettings.AppSettings["connection"];
                public 

补充：软件开发 , C# ,