Popup Outlook contact makes the WinForm stuck and hold

[C# Programming]

Hi all

I would like to popup an Outlook contact via a Click button. The "Popup action" works fine~
However, after the outlook contact comes up, the WinForm(Form1) seem stuck and hold ....
I can't move, minimize and maximize the WinForm ?????
Any body know what is the problem in here ??
Thanks


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 Outlook = Microsoft.Office.Interop.Outlook;

namespace testing1
{
public partial class Form1 : Form
{
Outlook.Application oApp = new Outlook.Application();
public Form1()
{
InitializeComponent();
}

private void Form1_Load(object sender, EventArgs e)
{

}
private void FindContactEmailByName(string firstName, string lastName)
{
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)
{
FindContactEmailByName("Tom", "Lee");
}

}
}