Hi... I am using Inventor API using vb.net coding.and my need is to Change the material of the document.my code is working but when I change the material the mass didn't changed.anyone know what is the problem.here is my code.


            Dim oParameters As Parameters
            oParameters = oPartDoc.ComponentDefinition.Parameters()

             Dim oLengthParam As Parameter
            oLengthParam = oParameters.Item _
                                      ("d0")
            oLengthParam.Expression = TextBox1.Text

            Dim oPropSet As PropertySet
            oPropSet = oPartDoc.PropertySets("Design Tracking Properties")

            oPropSet.Item("Material").Value = "Glass"

            oPartDoc.Update()