C#

public Settings setting = new Settings();

settings = new Settings();
settings.ShowDialog();
...

samskiter wrote:

I have declared my form as a class member variable ... because i want to only be able to show it once

try
            {
                this.setting.Activate();
            }
            catch
            {
                this.setting = new Settings();
                this.setting.Show();
            }

public sealed class SingletonForm : Form
{
    SingletonForm() { }
    public static SingletonForm Instance
    {
        get { return Nested.instance; }
    }
    private class Nested
    {
        static Nested() { }
        internal static readonly SingletonForm instance = new SingletonForm();
    }
}

public partial class Settings : Form<br />
    {<br />
        public Settings()<br />
        {<br />
            InitializeComponent();<br />
        }<br />
        public static Settings Instance<br />
        {<br />
            get { return Nested.instance; }<br />
        }<br />
        private class Nested<br />
        {<br />
            static Nested() { }<br />
            internal static readonly Settings instance = new Settings();<br />
        }<br />
    }

public sealed partial class Settings : Form
{
    private Settings()
    {
        InitializeComponent();
    }
    public static Settings Instance
    {
        get { return Nested.instance; }
    }
    private class Nested
    {
        static Nested() { }
        internal static readonly Settings instance = new Settings();
    }
}

public void COMMenuItem_Click(object sender, EventArgs e)
        {
            Settings.Instance.ShowDialog();
        }