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how to serialize IList<entity> in my webservice?

Last Modified: 2012-05-07
i am using ASP.NET and SQLServer 2005. i want to use webservice for data manipulation. i am having a class file to get, insert, update, delete the state list. when i called the getstate() directly from my aspx.cs page, its working fine. but now (for the first time where i am implementing webservice for manipulations in my project) when i try to invoke that webservice it makes runtime error. the error is

"Cannot serialize interface System.Collections.Generic.IList`1[[CityBeam.Entities.StateEntity, CityBeam.Entities, Version=, Culture=neutral, PublicKeyToken=null]]."

        public IList<StateEntity> GetStates()
            StateBO sObj = new StateBO();
            return sObj.GetStates();

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