//无密码的连接字符串

string conStr = "Provider=Microsoft.Ace.OleDb.12.0;Data Source=E://111.accdb;Persist Security Info=False";

　　　 　//有密码的连接字符串

string conStr = "Provider=Microsoft.Ace.OleDb.12.0;Data Source=E://111.accdb;Jet OleDb:DataBase Password=111";

//无密码的连接字符串

string conStr = "Provider=Microsoft.Jet.OleDb.4.0;Data Source=E://111.mdb;Persist Security Info=False";

　　　 　//有密码的连接字符串

string conStr = "Provider=Microsoft.Jet.OleDb.4.0;Data Source=E://111.mdb;Jet OleDb:DataBase Password=111";

string conStr = "Data Source=E://111.db;Password=111";

<startup useLegacyV2RuntimeActivationPolicy="true">
<supportedRuntime version="v4.0"/>
</startup>