Hi,
> I would use a c# dll that realize a visual control in a Delphi 5 program.
> Can I do this?
Yes.
> How?
You have to read details about COM Interop, take a look at the
following topic of MSDN: "Exposing .NET Framework Components to COM"
here is the corresponding link
http://msdn.microsoft.com/library/default.asp?url=/library/en-us/cpguide/html/cp
conexposingnetframeworkcomponentstocom.asp
As far as I remember there is no problem with COM objects in Delphi 5.
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With best wishes, Arthur Nesterovsky
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