网上下载了一个asp.net的源码 但是出现了 sms_conn.Open(); 的这段代码有问题 无法连接上数据库

文件附上的说默认数据库连接字符串在webconfig配置文件中修改。但是不知道应该如何修改（我用的是vs2010，sql server2008r2）下面附上配置希望大神能知道如何修改<?xml version="1.0"?><configuration> <appSettings> <add key="SMS_dbconn" value="server=.尀sql2008;Pooling=true;Min Pool Size=10;Max Pool Size=200;packet size=4096;data source=.尀sql2005;initial catalog=SMSstudent;uid=sa;pwd=sa" /> <add key="CrystalImageCleaner-AutoStart" value="true" /> <add key="CrystalImageCleaner-Sleep" value="60000" /> <add key="CrystalImageCleaner-Age" value="120000" /> </appSettings> <system.web> <compilation defaultLanguage="c#" debug="true"> <assemblies> </assemblies> </compilation> <authentication mode ="Forms"> <forms name ="AuthCookie" loginUrl="Logoin.aspx"></forms> </authentication> <authorization> <deny users="?"/> </authorization> <trace enabled="false" requestLimit="10" pageOutput="false" traceMode="SortByTime" localOnly="true"/> <sessionState mode="InProc" stateConnectionString="tcpip=127.0.0.1:42424" sqlConnectionString="data source=127.0.0.1;Trusted_Connection=yes" cookieless="false" timeout="20"/> <globalization requestEncoding="utf-8" responseEncoding="utf-8"/> <httpRuntime maxRequestLength="4096" executionTimeout="60" appRequestQueueLimit="100"/> <siteMap defaultProvider="defaultSiteMap"> <providers> <add name="defaultSiteMap" type="System.Web.XmlSiteMapProvider" siteMapFile="~/Web.sitemap"/> </providers> </siteMap> </system.web></configuration>原句<add key="SMS_dbconn" value="server=.尀sql2008;Pooling=true;Min Pool Size=10;Max Pool Size=200;packet size=4096;data source=.尀sql2005;initial catalog=SMSstudent;uid=sa;pwd=sa" ⼀>我把sql2005改成了2008