C#

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.Threading;
using Outlook = Microsoft.Office.Interop.Outlook;

namespace testing1
{
    public partial class Form1 : Form
    {
        Outlook.Application oApp = new Outlook.Application();
        string firstName;
        string lastName;

        public Form1()
        {
            InitializeComponent();
        }

        private void Form1_Load(object sender, EventArgs e)
        {

        }
        
        private void FindContactEmailByName() {

            //firstName = args1;
            //lastName = args2;
            Outlook.NameSpace outlookNameSpace = oApp.GetNamespace("MAPI");
            Outlook.MAPIFolder contactsFolder = outlookNameSpace.GetDefaultFolder(Microsoft.Office.Interop.Outlook.OlDefaultFolders.olFolderContacts);

            Outlook.Items contactItems = contactsFolder.Items;
            try
            {
                Outlook.ContactItem contact = (Outlook.ContactItem)contactItems.Find(String.Format("[FirstName]='{0}' and " + "[LastName]='{1}'", firstName, lastName));
                
                if (contact != null)
                {
                    contact.Display(true);
                }
                else
                {
                    MessageBox.Show("The contact information was not found.");
                }
            }
            catch (Exception ex)
            {
                throw ex;
            }
            /**/
        }
        private void button1_Click(object sender, EventArgs e)
        {
            firstName = "Tom";
            lastName = "Lee";
            popup();
        }

        private void button2_Click(object sender, EventArgs e)
        {
            firstName = "Peter";
            lastName = "Green";
            popup();
        }
        void popup() {
            Thread th = new Thread(FindContactEmailByName);
            th.Start();
        }
    }
}

//*********************************************************************
// public void log(string message)
// This function appends the message to the list box
//*********************************************************************
public delegate void LogDelegate(string s);
public void log(string message)
{
    if (InvokeRequired)
    {
        Invoke(new LogDelegate(log), new object[] { message });
    }
    else
    {
        lb.Items.Add(message);
        lb.TopIndex = lb.Items.Count - 1;
    }
} // End of void log()