How can I return a MATLAB object into a MWArray using MATLAB Builder for .Net?

How can I return a MATLAB object into a MWArray using MATLAB Builder for .Net?

c#

 MWCellArray cellout = null;

            MWNumericArray X = new MWNumericArray(new Int64());
            MWNumericArray Y = new MWNumericArray(new Int64());
            MWNumericArray Z = new MWNumericArray(new Int64());

            try
            {
                Class1 obj = new Class1();
                cellout = (MWCellArray)obj.FDH(X, Y, Z);
                MWNumericArray item1 = (MWNumericArray)cellout[1];
                MWNumericArray item2 = (MWNumericArray)cellout[2];
                MWCharArray item3 = (MWCharArray)cellout[3];
                Console.WriteLine("item1 is {0}", item1);
                Console.WriteLine("item2 is {0}", item2);
                Console.WriteLine("item3 is {0}", item3);
                double[,] native1 = (double[,])item1.ToArray(MWArrayComponent.Real);
                double[,] native2 = (double[,])item2.ToArray(MWArrayComponent.Real);
                char[,] native3 = (char[,])item3.ToArray();
                // Wait for user to exit application
                Console.ReadLine();
            }
            catch (Exception exception)
            {
                Console.WriteLine("Error: {0}", exception);
            }

error System.InvalidCastExcepiton: 'Mathwroks.MatLAB.NET.Arrays

cellout = (MWCellArray)obj.FDH(X, Y, Z); => X Y Z I think this is problem which is casting...