从ConnectionStringSettings获得数据库连接。使程序与具体数据库

//using System.Data; //using System.Data.Common; ConnectionStringSettings aSett = System.Configuration.ConfigurationManager.ConnectionStrings["configedDB"]; DbProviderFactory aF = DbProviderFactories.GetFactory(aSett.ProviderName); DbConne

//using System.Data;
//using System.Data.Common;

ConnectionStringSettings  aSett = System.Configuration.ConfigurationManager.ConnectionStrings["configedDB"];
            DbProviderFactory aF = DbProviderFactories.GetFactory(aSett.ProviderName);
            DbConnection aconn = aF.CreateConnection();
            aconn.Open();