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Confused: cwick which asked the question states at his edit: unmanaged resources such as database connections and bitmaps.

But in the code part of accepted answer:

//Free managed resources too

means freeing: 

this.databaseConnection
this.frameBufferImage

So: database connections and bitmaps are managed or unmanaged resources?

DAme
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ilias iliadis
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    Unmanaged. But you never use an unmanaged resource directly, you use a friendly managed wrapper so you can use it in C#. The code in the wrapper typically uses pinvoke to make unmanaged function calls. One characteristic of such a wrapper is that it will have a Dispose() method and that it is important that you call it. – Hans Passant May 23 '19 at 21:54

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They are unmanaged resources

The most common types of unmanaged resource are objects that wrap operating system resources, such as files, windows, network connections, or database connections.

https://docs.microsoft.com/en-us/dotnet/standard/garbage-collection/unmanaged

Boris Sokolov
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