public class OraZugriff {
     private OraConnStr = "Data Source=OraDb;" +
                           "User ID=User;" +
                           "Password=Pass;";

     private OracleConnection dbcon = null;
     private string OraCmdStr = "SELECT Wert FROM OraTabelle";
     private StringBuilder OraResult;

     public string[] OraConnect()
     {
         OraConn = new OracleConnection (OraConnStr);

         OraConn.Open();
         OracleCommand OraCmd = OraConn.CreateCommand();

         OraCmd.CommandText = OraCmdStr;
         OracleDataReader OraReader = OraCmd.ExecuteReader();

         while (OraReader.Read ()) {
               OraResult.Append( (string) OraReader["Wert"]);

         }

         OraConn.Close();
         OraReader.Close();
         OraCmd.Dispose();
         return OraResult.ToString(); 
      }
}