How to pass generic object in wcf service....

Hello

I want to write a wcf service where there will be a generic list of object as a parameter and a enum to define the type of object. The generic object can have a single entity or multiple entities. And the entity can be a single Client or a collection of Clients or may be a single Employee or a Collections of Employees and so on. But the problem is wcf service don't take any kind of generic object as a parameter.

Is there any way to this?
What I want to do is something like below:

In the Client side the method will be..

public string EmployeeInformation(List<Employee> objEmployee)
{
    try
{

    string IsSuccess = "";
    WCF_Service_Reference objWCFService = new WCF_Service_Reference();
    List<Object> objList = objEmployee;  
    IsSuccess = objWCFService.ActionMapping(objList,(int)EnumEntities.Employee);
    return IsSuccess;
}
catch()
{
-----
------
}    
}

At the server in WCFService.svc.cs file the implementation of the service should be some thing similar like below:

public string ActionMapping(List<Object> objList, int nEntityInfo)
{

(EnumEntities) EnumEnt = (EnumEntities)nEntityInfo;

   swicth(EnumEnt)
   {
             case EnumEnt.Employee :
             List<Employee> objEmployee = objList;
             PerformOperation(objEmployee);
             break:

             case EnumEnt.User:
             List<User> objUser = objList;
             PerformOperation(objUser);
             break;

             case EnumEnt.Bank:
             List<Bank> objBank = objList;
             PerformOperation(objBank);
             break;

             default:
             break:
             
   }
}

The problem is that the service not taking List<Object> objList as a Serialized object which is obvious why. But Is there any way to do the same some how. so that I can use only one service method for all of my entities. Any help or hints would be highly appreciated.


Thanking in Advance
Johnny