PetShop 4.0 中Web.config文件中的连接字符串是加密的，需要进行解密才能看到。
这个问题PetShop 4.0的ReadMe文件中有说明：
Encrypting and Decrypting the Connection Strings
Run <Pet Shop 4 Install Folder>\EncryptWebConfig.bat or DecryptWebConfig.bat to encrypt or decrypt connection strings in Web.config.
Note: If you select the “Full Install” option during setup, Web.config is automatically encrypted. Use DecryptWebConfig.bat should you need to decrypt it.
EncryptWebConfig.bat 和 DecryptWebConfig.bat是批处理文件，可用记事本打开，查看命令的具体内容。
可新建一最简单的网站Web1，把PetShop的Web.config文件复制过来。在IIS建个虚拟目录web1指向这个网站，然后，“开始”→ “运行”→ “cmd“，打开控制台程序，
在路径：C:\WINDOWS\Microsoft.NET\Framework\v2.0.50727 中，运行：
C:\WINDOWS\Microsoft.NET\Framework\v2.0.50727>aspnet_regiis -pd "connectionStrings" -app "/web1"
正在解密配置节...
成功!
解密后的连接字符串如下：
<connectionStrings>
<add name="SQLProfileConnString" connectionString="server=SPXY-WYH\sqlexpress;database=MSPetShop4Profile;integrated security=SSPI;min pool size=4;max pool size=4;"
providerName="System.Data.SqlClient" />
<add name="SQLMembershipConnString" connectionString="server=SPXY-WYH\sqlexpress;database=MSPetShop4Services;integrated security=SSPI;min pool size=4;max pool size=4;"
providerName="System.Data.SqlClient" />
<add name="SQLConnString1" connectionString="server=SPXY-WYH\sqlexpress;database=MSPetShop4;integrated security=SSPI;min pool size=4;max pool size=4;"
providerName="System.Data.SqlClient" />
<add name="SQLConnString2" connectionString="server=SPXY-WYH\sqlexpress;database=MSPetShop4;integrated security=SSPI;max pool size=4;min pool size=4;"
providerName="System.Data.SqlClient" />
<add name="SQLConnString3" connectionString="server=SPXY-WYH\sqlexpress;database=MSPetShop4Orders;integrated security=SSPI;min pool size=4;max pool size=4;"
providerName="System.Data.SqlClient" />
<add name="OraProfileConnString" connectionString="" providerName="System.Data.OracleClient" />
<add name="OraMembershipConnString" connectionString="" providerName="System.Data.OracleClient" />
<add name="OraConnString1" connectionString="" providerName="System.Data.OracleClient" />
<add name="OraConnString2" connectionString="" providerName="System.Data.OracleClient" />
<add name="OraConnString3" connectionString="" providerName="System.Data.OracleClient" />
</connectionStrings>
也可以反过来对这个连接字符串进行加密：
运行：
C:\WINDOWS\Microsoft.NET\Framework\v2.0.50727>aspnet_regiis -pe "connectionStrings" -app "/aaa" -prov "RsaProtectedConfigurationProvider"
正在加密配置节...
成功!
加密后的连接字符串：
<connectionStrings configProtectionProvider="RsaProtectedConfigurationProvider">
<EncryptedData Type="http://www.w3.org/2001/04/xmlenc#Element"
xmlns="http://www.w3.org/2001/04/xmlenc#">
<EncryptionMethod Algorithm="http://www.w3.org/2001/04/xmlenc#tripledes-cbc" />
<KeyInfo xmlns="http://www.w3.org/2000/09/xmldsig#">
<EncryptedKey xmlns="http://www.w3.org/2001/04/xmlenc#">
<EncryptionMethod Algorithm="http://www.w3.org/2001/04/xmlenc#rsa-1_5" />
<KeyInfo xmlns="http://www.w3.org/2000/09/xmldsig#">
<KeyName>Rsa Key</KeyName>
</KeyInfo>
<CipherData>
<CipherValue>aCLHvPwcwd2iz97a5HQUYFVh7pwMy7fpecNsvLNlh3Xtz3KXRRDtPO8P3HjMRgv2OrAmGoCw2Kza98J+zmbgkpFx34j2vToBa8mTWsUh1UEMcvf93I/of4jnVxwZBZdB+x/Oe1wK9LzyNN9D3xYjP8TZybBKmXW8p8hb1f3KkQY=</CipherValue>
</CipherData>
</EncryptedKey>
</KeyInfo>
<CipherData>
<CipherValue>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</CipherValue>
</CipherData>
</EncryptedData>
</connectionStrings>
上面命令中，“-pe“选项表示对Web.config文件加密；“-app“选项可标识奖其加密为Web.config文件的应用程序，如果末使用“-prov"选项指定提供程序，将使用配置为DefaultProvider的提供程序。（加密结果会不一样吧...）
参考书目：茅健编著.ASP.NET 2.0+SQL Server 2005全程指南.北京：电子工业出版社，2008