Hi, I've got a strange problem when I'm returning a DataSet through one of my WebService methods (ExecuteReaderWS(string commandText)): It returns the above exception at: [SoapException: Server was unable to process request. --> String was not recognized as a valid DateTime.] System.Web.Services.Protocols.SoapHttpClientProtocol.ReadResponse(SoapClient Message message, WebResponse response, Stream responseStream, Boolean asyncCall) +1501 System.Web.Services.Protocols.SoapHttpClientProtocol.Invoke(String methodName, Object[] parameters) +218 Where's that coming from? I'm adressing a SQL Server 2000 database. I don't know, but is it an error to use SMALLDATETIME columns in SQL Server? Your quick reply is quite appreciated! TIA, Axel Dahmen