Regarding WCF service

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C#

ASP.NET

WCF

I have created a WCFservice.find the below interface service class

IService.cs

[ServiceContract]
    public interface IService
    {
        [OperationContract]
        DataSet GetStandards();

    }

Service.cs

[DataContract]
    [ExceptionShielding("ServicePolicy")]
    public class Service : IService 
    {
        

        public DataSet GetStandards()
        {
            Standard standard = new Standard();
            DataSet objResponseBE;
            objResponseBE = standard.GetStandards();
            return objResponseBE;
        }

    }

I have also created proxy class for that wcf service
Though that proxy class i am calling business layer and through business layer called DAL
in business layer GetStandard function which return object type in the DAL layer class function i am getting dataset which i am passing it to business layer function GetStandard where return type is object.When comming to this level i am not getting error.But when wcf service gets the response from business layer i am getting following error

There was an error while trying to serialize parameter

http://tempuri.org/:GetStandardsResult.The InnerException message was <br />
'Type 'System.Data.DataSet' with data contract name 'DataSet:http://schemas.datacontract.org/2004/07/System.Data' is not expected.

Consider using a DataContractResolver or add any types not known statically to the list of known types - for example,
by using the KnownTypeAttribute attribute
or by adding them to the list of known types passed to DataContractSerializer.'.

but when i am passing datset in all layer funtion i am not getting error
But i want to pass object because always i am not getting dataset if i am getting error then how can i pass that.So for that i have used return type as object
please help me into this...