namespace WindowsFormsApplication1
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private bool change = true;
        private void timer1_Tick(object sender, EventArgs e)
        {
            if (change == true)
                button1.ForeColor = System.Drawing.Color.Black;
            else
                button1.ForeColor = System.Drawing.Color.Orange;
            change = !change;
        }

        private void button1_Click(object sender, EventArgs e)
        {

        }
    }
}