How to login SAP without single signon through vb.net

How to login SAP without single signon through vb.net, i have used below code but got below err msg can you able to help on this.

Error message:

An unhandled exception of type 'System.Exception' occurred in Microsoft.VisualBasic.dll

Additional information: Cannot create ActiveX component.

Code used:

Dim application AsObject

Dim SapGui AsObject

Dim connection AsObject

Dim session AsObject

application = CreateObject("SAPGUI.ScriptingCtrl.1")

SapGui = GetObject("SAPGUI")

application = SapGui.GetScriptingEngine

connection = application.OpenConnection("**", True)

session = connection.children(0)

session.findById("wnd[0]/usr/txtRSYST-BNAME").text = "**"

session.findById("wnd[0]/usr/pwdRSYST-BCODE").text = "**"

session.findById("wnd[0]").sendVKey(0)