static public class DBConnect {
    private static string orabd;
    private static OracleConnection conn=null;
    public static void init(string name, string pass)
    {
        orabd = "Data Source=" + ConfigurationManager.AppSettings.Get("TNSName").ToString() + ";Password=\"" + pass + "\";User ID=" + name + ";";
    }
    public static OracleConnection getConnetion()
    {
        if (conn == null)
        {
            conn = new OracleConnection(orabd);
            conn.Open();
        }
        if (conn.State == ConnectionState.Closed) conn.Open();
        return conn;
    }
}