I am using the following code supplied by Josh Brady here.

Public Sub main()
        Dim swApp As SldWorks
        Dim swModel As ModelDoc2
        Dim sSkSegmentsName(5) As String
        Dim swSelMgr As SolidWorks.Interop.sldworks.SelectionMgr
        Dim swFeat As SolidWorks.Interop.sldworks.Feature
        Dim swSketch As SolidWorks.Interop.sldworks.Sketch
        Dim vSkSegArr As Object
        Dim vSkSeg As Object
        Dim swSkSeg As SolidWorks.Interop.sldworks.SketchSegment
        Dim swSkLine As SolidWorks.Interop.sldworks.SketchLine
        Dim swSkArc As SolidWorks.Interop.sldworks.SketchArc
        Dim swSkEllipse As SolidWorks.Interop.sldworks.SketchEllipse
        Dim swSkSpline As SolidWorks.Interop.sldworks.SketchSpline
        Dim swSkText As SolidWorks.Interop.sldworks.SketchText
        Dim swSkParabola As SolidWorks.Interop.sldworks.SketchParabola
        Dim vID As Object
        Dim write As String = "Begin:" & vbCrLf
        Dim value As Double = 0

        Try
            swApp = Me.SolidWorksApplication
            swModel = swApp.ActiveDoc
            swSelMgr = swModel.SelectionManager
            swFeat = swSelMgr.GetSelectedObject5(1)
            swSketch = swFeat.GetSpecificFeature2

            System.Diagnostics.Trace.WriteLine("Feature = " & swFeat.Name & " [" & swSketch.Is3D & "]")
            System.Diagnostics.Trace.WriteLine("  Sketch Segments:")

            vSkSegArr = swSketch.GetSketchSegments
            For Each vSkSeg In vSkSegArr
                swSkSeg = vSkSeg

                vID = swSkSeg.GetID
                System.Diagnostics.Trace.WriteLine("ID = [" & vID(0) & "," & vID(1) & "]")

                Select Case swSkSeg.GetType
                    Case swSkSegments_e.swSketchLINE
                        swSkLine = swSkSeg
                        swSkLine.Angle = 0.6
                        System.Diagnostics.Trace.WriteLine("Line")
                        swSkLine.Angle = 0.9

                    Case swSkSegments_e.swSketchARC
                        swSkArc = swSkSeg
                        System.Diagnostics.Trace.WriteLine("Arc")
                    Case swSkSegments_e.swSketchELLIPSE
                        swSkEllipse = swSkSeg
                        System.Diagnostics.Trace.WriteLine("Ellipse")
                    Case swSkSegments_e.swSketchSPLINE
                        swSkSpline = swSkSeg
                        System.Diagnostics.Trace.WriteLine("Spline")
                    Case swSkSegments_e.swSketchTEXT
                        swSkText = swSkSeg
                        System.Diagnostics.Trace.WriteLine("Text")
                    Case swSkSegments_e.swSketchPARABOLA
                        swSkParabola = swSkSeg
                        System.Diagnostics.Trace.WriteLine("Parabola")
                    Case Else
                        System.Diagnostics.Trace.WriteLine("Else statement - not a sketch entity")
                End Select
            Next vSkSeg

        Catch ex As Exception
            System.Diagnostics.Trace.WriteLine(ex.ToString)
        End Try

    End Sub

I am trying to delete all splines in a sketch. The SketchSpline class does not have a delete method. I have been looking and looking for the right way/class to use but am having a hard time finding the correct class. I am using a VSTA app and the vb.net examples in the help file all seem to actually be VB6 examples.

Can someone point me in the right direction here?