hi All,
I was finally able to figure out the issue. In integration guide it was not mentioned that in provider chatidentity , while providing user loginname , we need to add "USER:" & Loginname.
when i modified my code from
Dim empcode As String = HttpContext.Current.Session("USER_EMP_CODE").ToString
to
Dim empcode As String = "User:" & HttpContext.Current.Session("USER_EMP_CODE").ToString
it worked for me .
Thanks ADAM , TERRY