How-to: Logging Crashes Using MarkedUp

One of the most useful use-cases for MarkedUp is the ability for it to log and analyze all of the crashes users experience when consuming your apps in the Windows Store. As a developer, your number one priority is to ensure that your users are able to consume your app!


Rather than just give you a big crash dump file, MarkedUp gives you some context around why and how the crash occurred. We have a bunch of new reports and stats built around this feature specifically that we’ll be rolling out over the next few weeks ;)

I’ve written before about how to handle last-chance exceptions using WinJS, and today I’m going to show you how to use MarkedUp to capture last-chance exceptions in both C# / XAML and HTML5 / JavaScript.

How to Set Up MarkedUp Crash Logging in WinJS and WinRT

In the most recent version of MarkedUp (0.5.5 as of writing this) we expose a new method called LogLastChanceException – this is a special method designed to persist crash dumps to disk at the very last possible moment when an application crashes.

Both C# / XAML and WinJS provide a last-chance exception handler as an event off of the Application (WinRT | WinJS) object, and this is the tool you can use to log crashes.

In C# / XAML, you can log crashes using MarkedUp’s LogLastChanceException method and the Application.UnhandledException event like this:

In WinJS (HTML5 / JavaScript), you can do the same thing using Application.onerror event:


MarkedUp writes the crash dump to disk on your user’s machine when the app crashes, and the next time the user starts your application we transmit their crash dump data back to our servers for analysis and reporting.

We preserve the time that it happened locally on that user’s machine so you’ll always have completely verifiable data to accurately correlate when a crash did or did not happen.

Further Reading

If you have any additional questions about how to set up crash logging, please refer to MarkedUp’s SDK reference documentation on crash logging or contact support at!