Smart line is set of connected lines and/or arcs. The vertical smart line can be created using ProfileComplex or ProfileLineString . The below code snippet shows how to create a smart line using ProfileComplex and create vertical alignment for it.

Example

internal bool CreateVerticalAlignmentFromSmartLine(Alignment alignment)
        {
            //ConsensusConnectionEdit allows the persistence of civil objects to the dgn
            Bentley.CifNET.SDK.Edit.ConsensusConnectionEdit con = Bentley.CifNET.SDK.Edit.ConsensusConnectionEdit.GetActive();

            //Elements for creating profile parabola
            System.Collections.Generic.List<ProfileElement> profElems = new System.Collections.Generic.List<ProfileElement>();
            Bentley.GeometryNET.DPoint3d startPoint = new Bentley.GeometryNET.DPoint3d(0, 50.0);
            Bentley.GeometryNET.DPoint3d vPI_Point = new Bentley.GeometryNET.DPoint3d(400.0, 58.0);
            Bentley.GeometryNET.DPoint3d endPoint = new Bentley.GeometryNET.DPoint3d(800.0, 53.0);
            double lengthOfVerticalCurve = 400.0;

            //Create Profile parabola to create ProfileComplex object 
            Bentley.CifNET.LinearGeometry.ProfileLine baseElement1 = new Bentley.CifNET.LinearGeometry.ProfileLine(startPoint, vPI_Point);
            Bentley.CifNET.LinearGeometry.ProfileLine baseElement2 = new Bentley.CifNET.LinearGeometry.ProfileLine(vPI_Point, endPoint);
            Bentley.CifNET.LinearGeometry.ProfileParabola[] profileCurve = null;
            Bentley.CifNET.LinearGeometry.ProfileElement profile = null;

            if (baseElement1 as ProfileLine != null && baseElement2 as ProfileLine != null)
            {
                //Create profile parabola using 2 ProfileLine and length parameter
                profileCurve = Bentley.CifNET.LinearGeometry.ProfileParabolaConstructor.CreateTangentParabolaTwoLinesByLength(baseElement1, baseElement2, lengthOfVerticalCurve);
                profile = profileCurve[0];
            }

            //Create ProfileLines
            Bentley.CifNET.LinearGeometry.ProfileLine entranceTangent = new ProfileLine(startPoint, profile.StartPoint.Coordinates);
            profElems.Add(entranceTangent);

            profElems.Add(profile);

            Bentley.CifNET.LinearGeometry.ProfileLine exitTangent = new ProfileLine(profile.EndPoint.Coordinates, endPoint);
            profElems.Add(exitTangent);

            //Create ProfileComplex using 2 ProfileLine and one profile parabola
            Bentley.CifNET.LinearGeometry.ProfileComplex profileComplex = new ProfileComplex(profElems.ToArray());
            if (profileComplex == null) return false;

            //Transient mode start for saving changes to dgn
            con.StartTransientMode();

            //Create profile from Smart line
            Bentley.CifNET.GeometryModel.SDK.Profile verticalAlignment = alignment.CreateProfileByProfileElement(profileComplex, true, true);
            if (verticalAlignment == null) return false;

            //Set feature definition to profile
            verticalAlignment.SetFeatureDefinition("Alignment\\Geom_Baseline", "VA");

            //Save changes to dgn 
            con.PersistTransients();

            return true;
        }

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Output

This image shows the profile created from the above code snippet.