private void BT_MCash_Click(object sender, EventArgs e)
{
MCash f3 = new MCash(a, b, Phone_Login);
f3.Show();
this.Hide();
}
private void BT_MCash_Click(object sender, EventArgs e)
{
MCash f1 = new MCash(Substraction_, Pass_Substraction, Phone_Login);
f1.Show();
this.Hide();
}