Definition.FlatPattern works in VB.NET but not in C# - I get an Error - API

[fsdolphin]

I thought that the API calls would be the same for VB.NET (Visual Basic) and C#, but for some reason, I cannot access 

`Definition.FlatPattern` in Csharp the same way as in VB.NET.

Can someone be so kind and explain why do I get an error when trying to access `Definition.FlatPattern` from a component occurrence using Csharp but works fine in VB.NET?

Am I missing a reference to the API? See my imports in each language.

Here is the code...

VB.NET

        Imports System.Type
        Imports System.Activator
        Imports System.Runtime.InteropServices
        Imports Inventor        

        Dim asmDoc As AssemblyDocument
        asmDoc = _invApp.ActiveDocument

        Dim selSet As SelectSet
        selSet = asmDoc.SelectSet

        Try
            Dim compOcc As ComponentOccurrence
            Dim obj As Object

            For Each obj In selSet
                compOcc = obj

                If compOcc.Definition.Type = Inventor.ObjectTypeEnum.kSheetMetalComponentDefinitionObject Then
                    Dim oBend As FlatBendResult
                    For Each oBend In compOcc.Definition.FlatPattern.FlatBendResults
                        ' Do something
                    Next
                End If
            Next

        Catch ex As Exception
            MsgBox("Is the selected item a Component?")
            MsgBox(ex.ToString())
            Return
        End Try

C Sharp

       using System.Runtime.InteropServices;
       using Inventor;        

        AssemblyDocument asmDoc = default(AssemblyDocument);
        asmDoc =(AssemblyDocument)_invApp.ActiveDocument;

        SelectSet selSet = default(SelectSet);
        selSet = asmDoc.SelectSet;
            try
            {
                ComponentOccurrence compOcc = default(ComponentOccurrence);
                object obj = null;

                foreach (object obj_loopVariable in selSet)
                {
                    obj = obj_loopVariable;
                    compOcc = (ComponentOccurrence)obj;

                    if (compOcc.Definition.Type == Inventor.ObjectTypeEnum.kSheetMetalComponentDefinitionObject)
                    {
                        foreach (FlatBendResult fBendResult in compOcc.Definition.FlatPattern.FlatBendResults)// error in this line
                        {
                            // Do something
                        }
                        Console.WriteLine(compOcc.Definition.Type);// output: kSheetMetalComponentDefinitionObject
                    }
                }
            }
            catch (Exception ex)
            {
                MessageBox.Show("Is the selected item a Component?");
                MessageBox.Show(ex.ToString());
                return;
            }

ERROR Message:

'ComponentDefinition' does not contain a definition for 'FlatPattern' and no accessible extension method 'FlatPattern' accepting a first argument of type 'ComponentDefinition' could be found (are you missing a using directive or an assembly reference?)

[bradeneuropeArthur]

first define you SheetMetalComponentDefinitions:

Dim x As Inventor.SheetMetalComponentDefinition				
x = compOcc.Definition
x.FlatPattern.FlatBendResults 

Seems that this also not works ( not elegant!) for vb.net 

[jjstr8 · Accepted solution]

Try casting your component definition to a SheetMetalComponentDefinition.

foreach (FlatBendResult fBendResult in ((SheetMetalComponentDefinition)compOcc.Definition).FlatPattern.FlatBendResults)

By default, VB automatically casts to the correct type, where C# requires strict typing in this case.

[fsdolphin]

Casting it did the trick. Thanks a lot!