private void button2_Click(object sender, EventArgs e)
{
this.Close();
FrmSig f = new FrmSig();
f.Show();
}
private void button2_Click(object sender, EventArgs e)
{
button2.BackColor = Color.White;
button2.ForeColor = Color.Green;
FrmSig fs = new FrmSig();
fs.Show();
this.Hide();
}