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       private void passwordControl()
        {
            textBox1.PasswordChar = '*';
            textBox1.Text = "";
            textBox1.MaxLength = 10;
            textBox1.Show();
        }

 DateTime dNow = DateTime.Now;
            DateTime dExpiry = new DateTime(2010, 6, 10, 0, 0, 0, 0);
            DateTime About2Expire = dExpiry.Subtract( new TimeSpan(10,0,0,0) );
            

            if( dNow > About2Expire && dNow < dExpiry )
            { 
                MessageBox.Show("This item expires " + dExpiry);
            }
            else
            if( dNow >= dExpiry ) 
            {
                MessageBox.Show("This item has expired! Please reinstall!");

                //DialogResult result = MessageBox.Show("You can run it anyway, if you enter the correct password", "Run or Abort?", MessageBoxButtons.YesNo, MessageBoxIcon.Question, MessageBoxDefaultButton.Button2); 
                passwordControl();

                if (!textBox1.Text.Equals("12345"))
                    Abort();
            }                    

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        private void passwordControl()
        {
            textBox1.PasswordChar = '*';
            textBox1.Text = "";
            textBox1.MaxLength = 10;
            textBox1.Controls.Add(button);
            button.Click += new System.EventHandler(this.button_Click);

            textBox1.Show();
        }

        private void button_Click(object sender, System.EventArgs e)
        {

        }

...

 passwordControl();

                    if (!textBox1.Text.Equals("12345"))
                        Abort();