I am looking for a way to retrieve the current exception without having to pass it as a variable.

Suppose the following code

public void MakeItFail()
{
    try
    {
        throw new FailException();
    }
    catch // Yes I'm aware that this shouldn't be done, but I don't want to go through all the code base and change it
    {
        ShowMessage("An error occured");
    }
}

public void ShowMessage(string message)
{
    // How can I retrieve the exception here
}

In the watch window, I can use $exception to get the current exception. Is there is a code equivalent?