I there any way to add a macro programmatically to a doc(word) document?

I there any way to add a macro programmatically to a doc(Word) document and then save it?

Microsoft.Office.Interop.Word.Application newApp = new Microsoft.Office.Interop.Word.Application();
newApp.Visible = false;
object Unknown = Type.Missing;
var Source = filePath;
var doc = newApp.Documents.Open(Source);

var project = doc.VBProject;
var module = project.VBComponents.Add(vbext_ComponentType.vbext_ct_StdModule);

var macro = @"
Public Sub DoKbTest()
MsgBox ""Hello""
End Sub

Public Sub DoKbTestWithParameter(ByVal msg As String)
MsgBox msg
End Sub
";
module.CodeModule.AddFromString(macro);
//module.CodeModule.AddFromFile(vba);
newApp.Run("DoKbTest");
doc.SaveAs(finaldoc);