WCF - Error Handling - Creator of this service did not specify a Reason - wcf

Question

There are lot of threads with the same error but I could not find a suitable answer so putting it again.
I have a wcf service and I have error handling in place and when I test the service from the wcftestclient all I get is this error info and not the original error that actually occurred.
The creator of this fault did not specify a Reason. Server stack trace: at System.ServiceModel.Channels.ServiceChannel.HandleReply(ProxyOperationRuntime operation, ProxyRpc& rpc) at ...
I am not sure why its not returning me the actual error. My error handling code is given below.
/// <summary>
/// Gets the holidays.
/// </summary>
/// <returns>List<HolidayProfile></returns>
[OperationContract]
[FaultContract(typeof(ExceptionFaultContract))]
List<HolidayProfile> GetHolidays();
public List<HolidayProfile> GetHolidays()
{
List<HolidayProfile> holidayProfileList = new List<HolidayProfile>();
try
{
customerBL = new CustomerBL(new CustomerRepository());
holidayProfileList = customerBL.GetHolidays();
}
catch (CustomException ex)
{
throw new FaultException<ExceptionFaultContract>(DBHelper.MapException(ex));
}
return holidayProfileList;
}
I have used two custom Exception classes here. One which is derived from Exception and other is the one which will be passed between the service and client
/// <summary>
/// Class CustomException.
/// </summary>
/// <seealso cref="System.Exception" />
public class CustomException : Exception
{
/// <summary>
/// Gets or sets the error code.
/// </summary>
/// <value>The error code.</value>
public string ErrorCode { get; set; }
/// <summary>
/// Gets or sets the error detail.
/// </summary>
/// <value>The error detail.</value>
public string ErrorDescription { get; set; }
/// <summary>
/// Gets or sets the error number.
/// </summary>
/// <value>The error number.</value>
public int ErrorNumber { get; set; }
}
and another which is the datacontract.
/// <summary>
/// Class ExceptionFaultContract.
/// </summary>
[DataContract]
public class ExceptionFaultContract : Exception
{
/// <summary>
/// Gets or sets the error code.
/// </summary>
/// <value>The error code.</value>
[DataMember]
public string ErrorCode { get; set; }
/// <summary>
/// Gets or sets the error number.
/// </summary>
/// <value>The error number.</value>
[DataMember]
public int ErrorNumber { get; set; }
/// <summary>
/// Gets or sets the error description.
/// </summary>
/// <value>The error description.</value>
[DataMember]
public string ErrorDescription { get; set; }
}
My method in the dataacess.
public List<HolidayProfile> GetHolidays()
{
Initializations
try
{
Code here...
}
catch (OracleException ox)
{
throw (DBHelper.HandleOracleException(ox));
}
catch (Exception ex)
{
throw (DBHelper.HandleException1(ex));
}
finally
{
if (connection != null)
connection.Close();
if (command != null)
command = null;
if (dataAdapter != null)
dataAdapter = null;
dataSet.Dispose();
}
return holidayProfileList;
}
My helper class which does the mapping.
/// <summary>
/// Handles the exception.
/// </summary>
/// <param name="ex">The ex.</param>
/// <returns>ExceptionFaultContract.</returns>
public static CustomException HandleException(Exception ex)
{
CustomException customException = new CustomException();
customException.ErrorDescription = ex.Message;
return customException;
}
/// <summary>
/// Maps the exception.
/// </summary>
/// <param name="ex">The ex.</param>
/// <returns>ExceptionFaultContract.</returns>
public static ExceptionFaultContract MapException(CustomException ex)
{
ExceptionFaultContract exceptionFaultContract = new ExceptionFaultContract();
exceptionFaultContract.ErrorCode = ex.ErrorCode;
exceptionFaultContract.ErrorNumber = ex.ErrorNumber;
exceptionFaultContract.ErrorDescription = ex.ErrorDescription;
return exceptionFaultContract;
}
I m getting an error if I m using the ExceptionFaultContract to be returned from data access ("Error : should be a type derived from exception") and If I try to derive the same from Exception another error saying it cannot be both serializable and derived member or something like that..
I tried lot of things nothing is clear to me...could somebody please help.