Following the suggestions of Sascha Lefèvre and Richard Deeming, I changed the App.Config for:
<configuration>
<configSections>
<section name="dataConfiguration" type="Microsoft.Practices.EnterpriseLibrary.Data.Configuration.DatabaseSettings, Microsoft.Practices.EnterpriseLibrary.Data, Version=4.1.0.0, Culture=neutral, PublicKeyToken=null"/>
</configSections>
<dataConfiguration defaultDatabase="ConnString"/>
<connectionStrings>
<add name="ConnString" providerName="System.Data.OleDb" connectionString="Provider=Microsoft.ACE.OLEDB.12.0;Data Source=D:\DataBase\CDL.accdb ;Persist Security Info=False" />
</connectionStrings>
</configuration>