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Editorial Team
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Asked: 2026-05-24T04:42:51+00:00

Whenever I try to debug my Windows Phone 7 C# app, I get the

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Whenever I try to debug my Windows Phone 7 C# app, I get the following message in the Output window:

A first chance exception of type 'System.OverflowException' occurred in mscorlib.dll

A first chance exception of type 'System.OverflowException' occurred in mscorlib.dll

A first chance exception of type 'System.InvalidOperationException' occurred in Microsoft.Phone.dll

…And then, App.xaml.cs opens up in VS (still in debug mode, where I can’t edit anything), and “System.Diagnostics.Debugger.Break();” is highlighted.

Why is this happening, how can I fix it, and how can I prevent it in the future?

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1 Answer

  1. Editorial Team

    Why it happened:

    I had an image that was used in MainPage.xaml. This image’s source’s Copy to Output directory property was set to Do not copy, and as a result, the image failed to load and the app crashed.

    How to Fix It:

    Change the image in question’s source’s Copy to Output directory property to Copy Always from Do not copy.

    How it can be prevented:

    Don’t fiddle with my image’s Copy to Output directory properties.

    …and what caused the System.OverflowException:

    My low disk space [I think] is what is causing the System.OverflowExceptions, because these continued to pop up in my Output window after I fixed the problem. Read up on System.OverflowExceptions here.

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