This code changes the textbox instantly to red. I want it like, click button then red, again then green.

private void button1_Click(object sender, EventArgs e)
{

    textBox1.BackColor = System.Drawing.Color.Black;

    if (textBox1.BackColor.Equals(System.Drawing.Color.Black)) 
    {
        textBox1.BackColor = System.Drawing.Color.Red;
    }



    if (textBox1.BackColor.Equals(System.Drawing.Color.Red))
    {
        textBox1.BackColor = System.Drawing.Color.Green;
    }



    if (textBox1.BackColor.Equals(System.Drawing.Color.Green))
    {
        textBox1.BackColor = System.Drawing.Color.Blue;
    }



    if (textBox1.BackColor.Equals(System.Drawing.Color.Blue))
    {
        textBox1.BackColor = System.Drawing.Color.Red;
    }
}