Something

using System;
using System.Data;
using System.Configuration;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
using System.Data.SqlClient;


public partial class _Default : System.Web.UI.Page 
{    
    protected void Page_Load(object sender, EventArgs e)
    {   
        if (!IsPostBack) {                    
            SqlConnection conn = new SqlConnection("Data Source=.\\SQLEXPRESS;AttachDbFilename=|DataDirectory|\\Collaborate.mdf;Integrated Security=True;User Instance=True");
            SqlDataAdapter adapt = new SqlDataAdapter("SELECT * FROM chat_rooms", conn);
            DataSet ds = new DataSet();

            adapt.Fill(ds, "roomName");            
            Repeater1.DataSource = ds;
            Repeater1.DataBind();        
        }

        if (User.IsInRole("administrators"))
        {
            Button adminButton = (Button)LoginView1.FindControl("adminButton");
            if (adminButton!=null)
            {
                adminButton.Visible = true;
            }
        }
    }

    protected void adminButton_Click(object sender, EventArgs e)
    {
        UserProcess.Admin_Menu();        
    }

    protected void chatRoom_Click(object sender, CommandEventArgs e)
    {        
        UserProcess.Join_Room(e.CommandArgument.ToString());        
    }
}





<%@ Page Language="C#" AutoEventWireup="true"  CodeFile="Default.aspx.cs" Inherits="_Default" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
    <title>Wallrich Landi - Collaborate</title>
</head>
<body>
    <form id="form1" runat="server">    
    <div>    
    <asp:LoginView ID="LoginView1" runat="server">    
      <AnonymousTemplate>
        <asp:Login ID="Login1" runat="server" DestinationPageUrl="Default.aspx"></asp:Login>
      </AnonymousTemplate>
      <LoggedInTemplate>
        Thanks for logging in <asp:LoginName id="LoginName1" runat="Server" />.                                        
        <asp:Button ID="adminButton" runat="server" Text="Admin Tools" Visible="false" OnClick="adminButton_Click" />
        <h2>Rooms</h2>
        <!--<asp:LinkButton Runat="Server" Text="Lobby"
          OnCommand="chatRoom_Click" 
          CommandName="Join_Room"
          CommandArgument="Lobby"
        />-->
        <asp:Repeater ID="Repeater1" runat="server">
          <ItemTemplate>            
            <%# DataBinder.Eval(Container.DataItem, "roomName") %>
          </ItemTemplate>
        </asp:Repeater>        
      </LoggedInTemplate>      
    </asp:LoginView>            
    </div>
    </form>
</body>
</html>