PowerPointApplication ppta = new PowerPointApplication();
FileStream fStrm = new FileStream(@"C:\Sales\2003\June.pptx", FileMode.Open);
Presentation pres = ppta.Open(fStrm);
Dim ppta As New PowerPointApplication()
Dim fStrm As FileStream = New FileStream("C:\Sales\2003\June.pptx", FileMode.Open)
Dim pres As Presentation = ppta.Open(fStrm)