连接字符串

[MAIN]

           string dataDir = AppDomain.CurrentDomain.BaseDirectory;
            if (dataDir.EndsWith(@"\bin\Debug\") || dataDir.EndsWith(@"\bin\Release\"))
            {
                dataDir = System.IO.Directory.GetParent(dataDir).Parent.Parent.FullName;
                AppDomain.CurrentDomain.SetData("DataDirectory", dataDir);
            }

[SQL SERVER]

            SqlConnection conn = new SqlConnection (@"Data    Source=.\SQLEXPRESS;AttachDBFilename=|DataDirectory|\Database1.mdf;
                Integrated Security=True;User Instance=True");
            conn.Open();

 

[ORACLE]

           OracleConnection conn = new OracleConnection(
                                     @"User Id=scott;Password=tiger;Data Source=myfirst");
           conn.Open();