Outlook 2007 CPU Monitor AddIn

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Drawing;
using System.Data;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.Diagnostics;

namespace CPU_Monitor_AddIn
{
    public partial class CPUMonitor : UserControl
    {
        string computer = Environment.MachineName;
        string configFile = @"C:\TEMP\MonitorAddIn\Monitor.xml";
        CPU_Monitor_AddIn.NewDataSet ds ;

        public CPUMonitor(string computerName,CPU_Monitor_AddIn.NewDataSet configDS)
        {
            InitializeComponent();
            ds = configDS;
            //Init the monitor controls.
            cpuMonitor1.TextUnit = "";            
            cpuMonitor1.StoreMax = false;
            cpuMonitor2.TextUnit = "";
            cpuMonitor2.StoreMax = false;
            //Init the prefCounters with the machineName.
            if(computerName=="")
                lblComputerName.Text = Environment.MachineName;
            else
            {
                computer = computerName;
                lblComputerName.Text = computerName;
            }
            this.perfCounter.MachineName = computer;
            this.perfCounter1.MachineName = computer;
            this.perfCounter2.MachineName = computer;
        }

        private void SampleTimer_Tick(object sender, EventArgs e)
        {
            try
            {
                //calculate the values of the monitors.
                int num = Convert.ToInt32(Math.Ceiling((double)this.perfCounter.NextValue()));
                cpuMonitor1.Value = (float)num;
                toolTip1.SetToolTip(cpuMonitor1, num.ToString() + "%");
                int maxMemory = Convert.ToInt32(Math.Round((double)this.perfCounter2.NextValue() / Math.Pow(1024, 2)));
                cpuMonitor2.Max = maxMemory;
                cpuMonitor2.Interval = maxMemory / 10;
                int memory = Convert.ToInt32(Math.Ceiling((double)this.perfCounter1.NextValue()) / Math.Pow(1024, 2));
                cpuMonitor2.Value = (float)memory;  
                toolTip1.SetToolTip(cpuMonitor2,"Commit Charge: "+ memory.ToString()+"M / " + maxMemory.ToString() + "M");
                lblError.Visible = false;
            }
            catch (Exception ex)
            {    
                //Show the error in the error label.
                lblError.Visible = true;
            }
        }

        private void btnSet_Click(object sender, EventArgs e)
        {
            try
            {
                //Set the computer name for the monitors and save it to the config file.
                computer = txtComputer.Text;
                if (computer == "")
                    computer = Environment.MachineName;
                perfCounter.MachineName = computer;
                perfCounter1.MachineName = computer;
                perfCounter2.MachineName = computer;
                ds.Tables[0].Rows[0]["ComputerName"] = computer;
                ds.WriteXml(configFile);
                lblComputerName.Text = computer;                
                txtComputer.Text = "";
                lblError.Visible = false;
            }
            catch (Exception ex)
            {
                //Show the error in the error label.
                lblError.Visible = true;
            }
        }

        private void txtComputer_KeyUp(object sender, KeyEventArgs e)
        {
            if (e.KeyCode == Keys.Enter)
            {
                btnSet.PerformClick();
            }
        }

        private void pbRemote_Click(object sender, EventArgs e)
        {
            Process.Start("mstsc.exe", "/v:" + computer);
        }

        private void pbManage_Click(object sender, EventArgs e)
        {
            Process.Start("compmgmt.msc", "/computer=" + computer);
        }
    }
}