If you're thinking about developing a custom control in .NET and dropping it on a VFP form, you can't do that.
You can use .NET through COM interop (and vice-versa) or you can use web services. Rick Strahl has some articles on VFP/.NET on his web site that may help you.
>With the introduction of .NET are we to assume that ActiveX will disappear? Will VFP8 allow the use of .NET components ?
Craig Berntson
MCSD, Microsoft .Net MVP, Grape City Community Influencer