Hi Bernard,

When upgrading I would recomend a gradual process.
Ok first you will need to upgrade the framework to 3.5, then upgrade to visual studios 2008.
Then upgrade the infragistics assemblies to the version you require.
To do this you can use our project upgrade utility, found in the start up menu.

You can refer to the following online help documentation article on upgrading ASP.NEt applications:
<http://help.infragistics.com/Help/NetAdvantage/NET/2008.3/CLR3.5/html/Web_Upgrading_Your_ASP_NET_Projects.html>

I am not sure which version of NetAdvantage you are currently using but for example if you are using 6.1 and are upgrading
to 8.3 then there have been alot of changes and you should have a look at our breaking changes articles to see how and if these changes effect your application.

This article refers specically to breaking changes in the grid:
<http://help.infragistics.com/Help/NetAdvantage/NET/2008.3/CLR3.5/html/WebGrid_Breaking_Changes_in_WebGrid.html>

These are overall breaking Changes:

<http://help.infragistics.com/Help/NetAdvantage/NET/2008.3/CLR3.5/html/Known_Issues_Known_Issues_and_Breaking_Changes.html>

I hope this information helps you.

Laxmi