How to find sum from obervablecollection list in C#

This episode is also available as a blog post: http://developerm.dev/2020/11/22/how-to-install-visual-code-opensuse-linux/

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This episode is also available as a blog post: http://developerm.dev/2020/11/08/flutter-showing-errortext-programmatically-in-a-statefullwidget/

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This episode is also available as a blog post: http://developerm.dev/2020/11/17/add-packages-to-dependency-in-nodejs/

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