Crystal Image Toolkit: thumbnail image control and picture viewing.

using System;
using System.Windows.Forms;

namespace WaitFormPictureShow
{
    /// <summary>
    /// Demonstrates how to call WaitPictureShowForm.
    /// </summary>
    public partial class Form1 : Form
    {
        private WaitPictureShowForm _waitForm = null;

        /// <summary>
        /// Default constructor.
        /// </summary>
        public Form1()
        {
            InitializeComponent();
        }

        /// <summary>
        /// Show the wait form when this main form is loaded.
        /// </summary>
        /// <param name="sender">Sender object.</param>
        /// <param name="e">Event arguments.</param>
        private void Form1_Load(object sender, EventArgs e)
        {
            ShowWaitForm();
        }

        /// <summary>
        /// Creates the wait form and ties into the WaitTerminated event handles.
        /// </summary>
        /// <returns>WaitPictureShowForm object.</returns>
        private WaitPictureShowForm GetWaitForm()
        {
            if (_waitForm == null)
            {
                _waitForm = new WaitPictureShowForm();
                _waitForm.WaitTerminated += new EventHandler(_waitForm_Terminated);
            }

            return _waitForm;
        }

        /// <summary>
        /// Handles the terminated event by closing the form.
        /// </summary>
        /// <param name="sender">Sender object.</param>
        /// <param name="e">Event arguments.</param>
        void _waitForm_Terminated(object sender, EventArgs e)
        {
            HideWaitForm();
        }

        /// <summary>
        /// Shows the Wait form over this main form.
        /// </summary>
        private void ShowWaitForm()
        {
            WaitPictureShowForm waitForm = GetWaitForm();
            waitForm.Show(this);
        }

        /// <summary>
        /// Hides the wait form by closing it.
        /// </summary>
        private void HideWaitForm()
        {
            if (_waitForm != null)
            {
                _waitForm.Hide();
                _waitForm.Close();
                _waitForm = null;
            }
        }

        /// <summary>
        /// Shows the wait form when the button is pressed.
        /// </summary>
        /// <param name="sender">Sender object.</param>
        /// <param name="e">Event arguments.</param>
        private void button1_Click(object sender, EventArgs e)
        {
            if (_waitForm == null)
                ShowWaitForm();
        }
    }
}