AutoCad 2007 & .NET

[er.deepakpuri]

 What is the best way to connect Autocad 2007 & .NET

I am trying by following method

Try
Cadapp = GetObject(, "Autocad.Application")
Catch ex As Exception
Cadapp = CreateObject("Autocad.Application")
End Try
If Cadapp.Documents.Count > 0 Then
For i = 0 To Cadapp.Documents.Count
Cadapp.Documents.Close() '(False)
Next

End If
Caddoc = Cadapp.Documents.Add
Caddoc = Cadapp.ActiveDocument
Cadapp.Visible = True

& getting error "Unable to cast COM object of type 'Autodesk.AutoCAD.Interop.AcadApplicationClass' to interface type 'Autodesk.AutoCAD.Interop.AcadApplication'"

Thanks 

Deepak

[Balaji_Ram]

Hi Deepak,

The best way would be to implement a plugin using .Net that can be netloaded in AutoCAD.

You would not need to use COM in that case.

About the error, you can try the following two points :

1) Verify if your project uses the interop assemblies from the correct ObjectARX version.

2) Try connecting to AutoCAD 2007 using a specific progid as in this code snippet.

const string progID = "AutoCAD.Application.17";
Type acType = Type.GetTypeFromProgID(progID);

Regards,

Balaji