Xamarin ships with the source code for Mono class libraries, and you can use this to debug the Xamarin (formerly known as Mono) source code:
- To be able to use this option, go to Debug | Options:
![](https://static.packt-cdn.com/products/9781788296243/graphics/assets/c218a48e-58fc-4e4d-bab2-4993c254a18d.png)
- Then, go to General, uncheck the Enable Just My Code option, and click OK:
![](https://static.packt-cdn.com/products/9781788296243/graphics/assets/30870a66-4f60-4194-a905-108a3fcce11f.png)
- Once this is disabled, we can step into Mono class libraries and debug them.