using Newtonsoft.Json.Schema; JsonSchema schema = null; schema.ThrowIfNull("Schema should not be null.");In the above example, the JsonSchema object is null and the ThrowIfNull method is used to throw an exception with the specified message "Schema should not be null." This method is useful in ensuring that a valid schema object is passed to other methods in the Newtonsoft.Json.Schema library. It helps avoid null reference exceptions and improves the robustness of the code.