A.Access：

  1 web.config中配置

   <add name="MyConnectionString" connectionString="Provider=Microsoft.Jet.OLEDB.4.0;Data Source=|DataDirectory|\\dbwangke.mdb"/>

   页面读取：

   public static string connectionString = ConfigurationManager.ConnectionStrings

    ["MyConnectionString"].ConnectionString;

  2 web.config中配置

   <connectionStrings>
  <add name="ConnStr" connectionString="Provider=Microsoft.Jet.OLEDB.4.0;Data Source="

     providerName="System.Data.OleDb"/>
  <add name="ConnStr1" connectionString="App_Data/XMXCMS.mdb" providerName="System.Data.OleDb"/>
 </connectionStrings>

   页面读取：

   ConnStr = ConfigurationManager.ConnectionStrings["ConnStr"].ToString() +

    System.Web.HttpContext.Current.Server.MapPath(ConfigurationManager.ConnectionStrings

    ["ConnStr1"].ToString());

 B.SQL Server 2000与SQL Server2005：

   web.config中配置

     <appSettings>
      <add key="ConnectionString" value="Server=.\shuang121;database=hnzbtb;uid=sa;pwd=123456;"/>

    </appSettings>

    2000：<connectionStrings>
      <add name="MyConnectionString" connectionString="server=.;uid=sa;pwd=sa;database=DB"/>

   </connectionStrings>

    2005：<connectionStrings>
       <add name="ConnString" connectionString="Data Source=3F997D393A77495;Initial 

         Catalog=MyOffice;Persist Security Info=True;User ID=sa;Password=123456"

         providerName="System.Data.SqlClient"/>
       </connectionStrings>

   <add name="suSoftConString" connectionString="server=.\sqlexpress;uid=sa;pwd=123456;database=puqiang;" providerName="System.Data.SqlClient"/>

     页面读取：

      public static readonly string connstring = 

          System.Configuration.ConfigurationManager.AppSettings["SQLConnString1"];

      public static string connectionString = ConfigurationManager.ConnectionStrings

         ["MyConnectionString"].ConnectionString;