I have a menu in the masterpage.  It all works great until I click on
the link that transfers to the page that I am on.  When I do this it
causes a stack overflow error.  I can see why it is doing this but I
am not sure what to do to fix it.  Any Help would be appreciated.

The code:
   <table cellspacing=0 cellpadding=5 width=770 border=0>
       <tr>
           <td width=130 valign=top>
               <asp:LinkButton ID="HomeLink" runat="server"
CssClass="MenuLink" NavigateUrl="Default.aspx"
OnClick="HomeLink_Click">Home</asp:LinkButton><br />
               <asp:LinkButton ID="AboutUsLink" runat="server"
CssClass="MenuLink" NavigateUrl="AboutUs.aspx"
OnClick="AboutUsLink_Click">About Us</asp:LinkButton><br />
               <asp:LinkButton ID="HowWeCanHelpLink" runat="server"
CssClass="MenuLink" NavigateUrl="HowWeCanHelp.aspx"
OnClick="HowWeCanHelpLink_Click">How we can help</asp:LinkButton><br /

               <asp:LinkButton ID="ProductLink" runat="server"
CssClass="MenuLink" NavigateUrl="Product.aspx"
OnClick="ProductLink_Click">Product</asp:LinkButton><br />
               <asp:LinkButton ID="ContactUsLink" runat="server"
CssClass="MenuLink" NavigateUrl="ContactUs.aspx"
OnClick="ContactUsLink_Click">Contact Us</asp:LinkButton><br />
           </td>
           <td valign=top style="border-left:1px solid black;" >
                   <asp:ContentPlaceHolder ID="MainHolder"
runat="server"></asp:ContentPlaceHolder>
           </td>
       </tr>
   </table>

public partial class MasterPage : System.Web.UI.MasterPage
{
   User u = new User();
   protected void Page_Load(object sender, EventArgs e)
   {
       if (!Session.IsNewSession & !IsPostBack)
       {
           u.GetUserByUserName(Session["UserName"].ToString());
           UserLabel.Text = u.FirstName;
       }
   }
   protected void AboutUsLink_Click(object sender, EventArgs e)
   {
           Session.Add("UserName", u.UserName);
           Server.Transfer("AboutUs.aspx", true);
   }
   protected void HomeLink_Click(object sender, EventArgs e)
   {
           Session.Add("UserName", u.UserName);
           Server.Transfer("Default.aspx", true);
   }
   protected void HowWeCanHelpLink_Click(object sender, EventArgs e)
   {
           Session.Add("UserName", u.UserName);
           Server.Transfer("HowWeCanHelp.aspx", true);
   }
   protected void ProductLink_Click(object sender, EventArgs e)
   {
           Session.Add("UserName", u.UserName);
           Server.Transfer("Product.aspx", true);
   }
   protected void ContactUsLink_Click(object sender, EventArgs e)
   {
           Session.Add("UserName", u.UserName);
           Server.Transfer("ContactUs.aspx", true);
   }
}