performance counters asp.net

<%@ Page Language="C#" AutoEventWireup="true" %>
<%@ Import Namespace="System" %>
<%@ Import Namespace="System.Diagnostics" %>
<%@ Import Namespace="System.Text" %>
<%@ Import Namespace="System.DirectoryServices" %>
<%@ Import Namespace="System.Collections.Generic" %>


<script type="text/C#" runat="server">

    protected void Page_Load(object sender, EventArgs e)
    {
        if (!IsPostBack)
        {
            populateIIS();
        }
    }

    private void populateIIS()
    {
        StringBuilder sb = new StringBuilder();
        sb.AppendFormat("Server: {0} Username: {1}<br/>", Environment.MachineName.ToString(), Environment.UserName.ToString());
        try
        {
            TimeSpan span = TimeSpan.FromSeconds(Convert.ToDouble(getCounter("Web Service", "Service Uptime", "_Total")));
            sb.Append(string.Concat(new object[] { "IIS Running - Uptime : ", span.Days, " Days, ", span.Hours, " Hours, ", span.Minutes, " Min <br/>" }));
        }
        catch { }
        sb.AppendFormat("Current Anonymous users: {0}<br/>", getCounter("Web Service", "Current Anonymous Users", "_Total"));
        sb.AppendFormat("Current Connections: {0}<br/>", getCounter("Web Service", "Current Connections", "_Total"));
        sb.AppendFormat("Max Connections: {0}<br/>", getCounter("Web Service", "Maximum Connections", "_Total"));
        sb.AppendFormat("Memory, Available MBytes: {0}<hr/>", getCounter("Memory", "Available MBytes", ""));
        sb.AppendFormat("ASP.NET Request Wait Time: {0}<br/>", getCounter("ASP.NET", "Request Wait Time", ""));
     
        sb.AppendFormat("ASP.NET Application Anonymous Requests: {0}<br/>", getCounter("ASP.NET Applications", "Anonymous Requests", "__Total__"));
        sb.AppendFormat("ASP.NET Sessions Active: {0}<br/>", getCounter("ASP.NET Applications", "Sessions Active", "__Total__"));
        sb.AppendFormat("ASP.NET Sessions Total: {0}<br/>", getCounter("ASP.NET Applications", "Sessions Total", "__Total__"));
        sb.AppendFormat("ASP.NET Applications Running: {0}<hr/>", getCounter("ASP.NET v2.0.50727", "Applications Running", ""));

        sb.Append("IIS Apps <br/>");
        foreach (string s in getIISApps())
        { sb.AppendFormat("{0}", s);}
        
        lblText.Text = sb.ToString();
    }

    public static string getCounter(string a, string b, string c)
    {
        string countervalue;
        try
        {
            string str = string.Empty;
            PerformanceCounter counter = new PerformanceCounter(a, b);
            counter.InstanceName = c;
            str = counter.NextValue().ToString();
            counter.Dispose();
            counter.Close();
            countervalue = str;
        }
        catch (Exception exception)
        {
            throw exception;
        }
        return countervalue;
    }
   

    private List<string> getIISApps()
    {
        List<string> sites = new List<string>();

        DirectoryEntry entry = new DirectoryEntry("IIS://" + Environment.MachineName + "/w3svc");
        try
        {
            foreach (DirectoryEntry entry2 in entry.Children)
            {
                if (entry2.SchemaClassName == "IIsWebServer")
                {
                    foreach (DirectoryEntry entry3 in entry2.Children)
                    {
                        string binding;
                        if (!(entry3.SchemaClassName == "IIsWebVirtualDir"))
                        {
                            continue;
                        }

                        if (entry2.Properties["ServerBindings"].Value.ToString() == "System.Object[]")
                        {
                            binding = "All Unassigned";
                        }
                        else
                        {
                            binding = entry2.Properties["ServerBindings"].Value.ToString();
                        }
                        sites.Add(string.Format("name: {0} - binding: {1}<br/>", entry2.Properties["ServerComment"].Value.ToString(), binding));
                    }
                   
                }
            }
        }
        catch (Exception ex)
        {
            throw ex;
        }
        return sites; 
    }

   

</script>
<asp:Label ID="lblText" runat="server" />