private void Add2_KeyDown(object sender, KeyEventArgs e)
{
if (e.KeyCode == Keys.ShiftKey | (e.KeyCode == Keys.Back && Add2.Text == ""))
{
Add1.Focus();
}
else if (e.KeyCode == Keys.Decimal && Add2.Text.Length >= 1)
{
Add3.Focus();
}
}
private void TxtIPAddress_Load(object sender, EventArgs e)
{
Add1.Focus();
}