problemer med webservice i webmatrix

Hej. Jeg prøver at lave en metode i webmatrix, der returner System.Data.SqlClient.SqlDataReader. Men i stedet returner den System.Data.IDataReader, som giver problemer: "Cannot serialize interface System.Data.IDataReader". Jeg bruger Matrix til at lave metoden. Hvad kan jeg gøre?

[WebMethod]
    public System.Data.IDataReader MyQueryMethod() {
        string connectionString = "server=\'sqlsrv\'; trusted_connection=true; database=\'book\'";
        System.Data.IDbConnection dbConnection = new System.Data.SqlClient.SqlConnection(connectionString);

        string queryString = "SELECT [Room].[RoomType], [Room].[RoomPrice] FROM [Room], [Hotel] WHERE (([Hotel]" +
".[Id] = [Room].[HotelId]) AND ([Hotel].[Id] = 1))";
        System.Data.IDbCommand dbCommand = new System.Data.SqlClient.SqlCommand();
        dbCommand.CommandText = queryString;
        dbCommand.Connection = dbConnection;

        dbConnection.Open();
        System.Data.IDataReader dataReader = dbCommand.ExecuteReader(System.Data.CommandBehavior.CloseConnection);

        return dataReader;
    }