ASP.NET

Home.aspx - within this page the navigation bar is displayed
<%@ Page Title="" Language="C#" MasterPageFile="~/MasterPage.master" AutoEventWireup="true" CodeFile="Home.aspx.cs" Inherits="_Default" %>

<asp:Content ID="Content1" ContentPlaceHolderID="head" Runat="Server">

</asp:Content>

Chat.aspx - when I browse to this page the navigation bar is not displayed
<%@ Page Title="" Language="C#" MasterPageFile="~/MasterPage.master" AutoEventWireup="true" CodeFile="Chat.aspx.cs" Inherits="Chat" %>

<asp:Content ID="Content1" ContentPlaceHolderID="head" Runat="Server">
</asp:Content>

MailMessage message = new MailMessage();
     message.From = new MailAddress("admin@mydomaincom");
     message.To.Add("email@mydomain.com");
     message.Subject = "EMAIL TEST FROM WEBSERVER";
     message.Body = "BODY";
     message.IsBodyHtml = true;
     SmtpClient smtp = new SmtpClient("relay-hosting.secureserver.net");
     smtp.Send(message);

protected void AddUnit_Click(object sender, EventArgs e)
   {
       AddParentNode();

       for (int i = 0; i <= AvailableUnitsTreeView.Nodes.Count - 1; i++)
       {
           AddUnits(AvailableUnitsTreeView.Nodes[i]);
       }


   }

private void AddParentNode()
   {
       if (SelectedUnitsTreeView.Nodes.Count== 0)
       {
           TreeNode Parentnode = new TreeNode();
           Parentnode.Text = AvailableUnitsTreeView.Nodes[0].Text;
           Parentnode.Value = AvailableUnitsTreeView.Nodes[0].Value;
           SelectedUnitsTreeView.Nodes.Add(Parentnode);
           SelectedUnitsTreeView.Nodes[0].ShowCheckBox = false;
       }


   private void AddUnits(TreeNode node)
   {
       for (int i = 0; i <= node.ChildNodes.Count-1; i++)
       {
           AddUnits(node.ChildNodes[i]);
           if (node.ChildNodes[i].Checked == true)
           {
               SelectedUnitsTreeView.Nodes.Add(node);
               SelectedUnitsTreeView.Nodes.Add(node.ChildNodes[i]);
              // AvailableUnitsTreeView.Nodes.Remove(node.ChildNodes[i]);
           }

       }

   }