dotnet setup: Does an upgrade mean changing the version number of the setup project as well as the version number of the assembly?

I have been having a problem implementing auto updater component. Suppose I am trying to install a new version( assembly version and the product code has been changed)
on a client machine which has older version installed then
the installation of the new version happens. However, in the Add/Remove Programs there are 2 entries( one for the old one and another for the new one).
Can someone please help why it is happening like this?


---
Posted using Wimdows.net NntpNews Component -

Are you using the RemoveExistingProducts Action in your installation?
Also, for a major upgrade, you will need to change the Version Number in
the MSI as well as the Product Code and Package Code.

Cheers,
Tim Macaulay, MCSD, MCP.Net
Microsoft Product Support