Using a Timer in C#

BFree has posted similar code in the time it took me to test this, but here's my attempt:

this.Hide();
var t = new System.Windows.Forms.Timer
{
    Interval = 3000 // however long you want to hide for
};
t.Tick += (x, y) => { t.Enabled = false; this.Show(); };
t.Enabled = true;

Quick and dirty solution taking advantage of closures. No Timer required!

private void Invisibilize(TimeSpan Duration)
    {
        (new System.Threading.Thread(() => { 
            this.Invoke(new MethodInvoker(this.Hide));
            System.Threading.Thread.Sleep(Duration); 
            this.Invoke(new MethodInvoker(this.Show)); 
            })).Start();
    }

Example:

// Makes form invisible for 5 seconds.

Invisibilize(new TimeSpan(0, 0, 5));

At the class level do something like this:

Timer timer = new Timer();
private int counter = 0;

In the constructor do this:

        public Form1()
        {
            InitializeComponent();
            timer.Interval = 1000;
            timer.Tick += new EventHandler(timer_Tick);
        }

Then your event handler:

void timer_Tick(object sender, EventArgs e)
        {
            counter++;
            if (counter == 5) //or whatever amount of time you want it to be invisible
            {
                this.Visible = true;
                timer.Stop();
                counter = 0;
            }
        }

Then wherever you want to make it invisible (I'll demonstrate here on a button click):

 private void button2_Click(object sender, EventArgs e)
        {
            this.Visible = false;
            timer.Start();
        }