配制

 <configSections>
  <section name="dataConfiguration" type="Microsoft.Practices.EnterpriseLibrary.Data.Configuration.DatabaseSettings, Microsoft.Practices.EnterpriseLibrary.Data" />
 </configSections>
 <dataConfiguration defaultDatabase="localHost">
  <providerMappings>
   <add name="Sql Server" databaseType="Microsoft.Practices.EnterpriseLibrary.Data.Sql.SqlDatabase, Microsoft.Practices.EnterpriseLibrary.Data" />
  </providerMappings>
 </dataConfiguration>

用微软企业库的时候web.config得这样配制