Combining two strings

[harryjjacobs]

Hi there,
I have two multi-line strings which I would like to be able to read line by line and then combine so that they alternate. Like this:

My two strings:

String 1:

Geoff                      
                            
Bob
                            
Jim

String 2:

      
Steve

Chris

Tom

And I would like them to be combined in to one string that looks like this:
Geoff
Chris
Bob
Tom
Jim
Steve
And then each line placed in to a listbox.

Any help would be much appreciated.

Thanks in advance,

H