Hi,
I'm not sure of the terminology here but...

I have a standalone assembly (Foo) and I log errors using a simple call
in my "catch" blocks: e.g.

class Foo
...
public DoSomething()
{
...
catch
{
LogError("blah", Severity.Error, etc....);
}
...
void LogError(msg,sev,...) { output.write(...) }
...
This assembly DLL will be referenced by other assemblies however each
of these calling assemblies may wish to log any errors their own way.
Can I make it so that the calling assembly somehow "overrides" the
LogError calls and writes the errors however it wishes. Ideally I'd
like:

using Foo
class Bar
...
Foo.DoSomething()
...
void LogError(msg) { showpopup(msg) }   <--(I want THIS LogError to run
when DoSomething goes wrong)

I'm looking at interfaces, abstract classes, virtual functions, etc.
but I'm not inherting anything here - just making calls to an assembly.

Hope someone can help.

Thanks.