Problem to display content in header menu according to different roles

I want to display header menu content according to different logins
I have code for it in vb but i ma not getting its equivalent in c#
So please let me know solution for it.
Equivalent code in vb
<ul id="tablist">
            <li><a href="main.aspx" id="menuhome">Home</a></li>
            
    <%If Session("groupid") = "1" Then%>
                            <li><a href="addcustomer.aspx" id="menuaddc">Add Company</a></li>
                            <li><a hre ...