我就在页面中拖了一个WebPartManager 什么也没干,一运行，出现错误

Server Error in '/myWebSite' Application.

An error has occurred while establishing a connection to the server.  When connecting to SQL Server 2005, this failure may be caused by the fact that under the default settings SQL Server does not allow remote connections. (provider: SQL Network Interfaces, error: 26 - Error Locating Server/Instance Specified)

Description: An unhandled exception occurred during the execution of the current web request. Please
review the stack trace for more information about the error and where it originated in the code.

SQLExpress database file auto-creation error:

The connection string specifies a local Sql Server Express instance using a database location within the applications App_Data directory. The provider attempted to automatically create the application services database because the provider determined that the database does not exist. The following configuration requirements are necessary to successfully check for existence of the application services database and automatically create the application services database:

1. If the applications App_Data directory does not already exist, the web server account must have read
2.  and write access to the applications directory. This is necessary because the web server account will automatically create the App_Data directory if it does not already exist.
3. If the applications App_Data directory already exists, the web server account only requires read and write access to the applications App_Data directory. This is necessary because the web server account will attempt to verify that the Sql Server Express database already exists within the applications App_Data directory. Revoking read access on the App_Data directory from the web server account will prevent the provider from correctly determining if the Sql Server Express database already exists. This will cause an error when the provider attempts to create a duplicate of an already existing database. Write access is required because the web server accounts credentials are used when creating the new database.
4. Sql Server Express must be installed on the machine.
5. The process identity for the web server account must have a local user profile. See the readme document for details on how to create a local user profile for both machine and domain accounts.

解决的办法是:
 在web.config文件中重新设置一下:
<connectionStrings>
<remove name="LocalSqlServer" />
<add name="LocalSqlServer" connectionString="Data Source=xxx;Initial Catalog=zzz;Integrated Security=true;"
providerName="System.Data.SqlClient" />
</connectionStrings>
同时在下面目录:
C:\WINDOWS\Microsoft.NET\Framework\v2.0.50727\下。
运行aspnet_regsql.exe此配制程序，可以方便的把aspnetdb里的存储过程和表移植到sql Server 2000等处.
.zzz为移植到的数据库表,例如Northwind
****因为vs2005依赖的就是express版的sql 2005里的aspnetdb ,而默认情况下LocalSqlServer的连接字符串是 
  <connectionStrings>
    <add name=LocalSqlServer connectionString="data source=\SQLEXPRESS.;Integrated Security=SSPI;
AttachDBFilename=|DataDirectory|aspnetdb.mdf;User Instance=true" providerName="System.Data.SqlClient" />
  </connectionStrings>
所以要先移除默认的连接字符串,添加一个新的连接字符串,如上面所示