Have a link Appear based on a condition MVC2

Is there a way for me to make a link appear on an MVC2 page based on a condition (to be exact, whether a user is in a role?)

UPDATE: some more information

Generally speaking I don't have anything yet... I was just wondering what the best way to go about doing this was...

I want the link to show up here in the site.Master

     <ul id="menu">
                <%
                    if(true){}
                     %>              
                <li><开发者_StackOverflow%: Html.ActionLink("Home", "Index", "Home")%></li>                   
                <li><%: Html.ActionLink("View Your Populations", "PopulationInfo", "PatientACO")%></li>                    
     </ul>

---

You will need to create a Model for each page view that has a UserIsInRole property (or whatever), and then you just check it and show the link based on that.

<ul id="menu">
                <%
                    if(true){}
                     %>              
                <li><%: Html.ActionLink("Home", "Index", "Home")%></li>     
                <% if (Model != null && Model.UserIsInRole()) { %>              
                <li><%: Html.ActionLink("View Your Populations", "PopulationInfo", "PatientACO")%></li>           
                <% } %>
     </ul>

EDIT:

ViewModel:

public class ViewModel
{
    public bool UserIsInRole {get;set;}
}

Controller:

public ActionResult Action()
{
    var viewModel = new ViewModel();
    viewModel.UserIsInRole = User.IsInRole("Role");
    return View(viewModel);
}

View:

<ul id="menu">
    <% if (Model.UserIsInRole) {
        <li><% Html.ActionLink("LinkText", "NewAction", "NewController") %></li>
    <% } %>
</ul>