What does "external code" in the call stack mean?

.net, c#, debugging, visual-studio

Solution

These are the lines where symbol information is not currently available for `Visual Studio Debugger`. In other words `Debugger` is not able to retrieve code from the line executed.

I wrote currently because the symbol information can be downloaded or setup.

For more information you can read this : How to: Specify Symbol Locations and Loading Behavior

Problem

I call a method in Visual Studio and attempt to debug it by going over the call stack. Some of the rows in it are marked "External code". What exactly does this mean? Methods from a `.dll` have been executed?

Original source

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