'TEST YOUR CODE ON A ON NON DEVELOPEMENT MACHINE!!!!

We have found that if complied against a different version of the SimplyPostCodeLookup.dll, and 
then shipped.  If the version of SimplyPostCodeLookup.dll on customer site does not match, then 
the .NET runtime gives an error:

Unabled to cast COM Object of type.

To resolve this:

Go into project.  Right click on properties.  Then in "references" tab, Delete the reference 
for Interop.ISimplyPostCodeCOMClass.dll 
 
Then click on the [Add] button.  Then after a wait select the "COM" tab.  Now select 
SimplyPostCodeLookup.dll, which should be in the c:\Windows\Windows32 directory.
 
Now build the project.  Now update the customers site with the main program and the 
"Interop.ISimplyPostCodeCOMClass.dll"

All instances of SimplyPostCodeLookup.dll must be the same on customers site.  This DLL 
is installed by running the InstallSimplyPostcodeCOM.EXE included in the root of the 
example code.
