I'm going to somewhat disagree. C#/SQL are great, but IMO, web is the way to go. And you can use C# for that.
>Your advice to them should be to find an alternative to VFP., VFP is dead and continuing to use it doesn't make any sense from a business perspective. Rewrite their app in C#/SQL.
Craig Berntson
MCSD, Microsoft .Net MVP, Grape City Community Influencer