private void AmountGiveTxt_TextChanged(object sender, EventArgs e)
{
if (AmountGiveTxt.Text != "")
{
if (!rg.Match(AmountGiveTxt.Text).Success)
{
AmountGiveTxt.Text = "";
AmountGiveTxt.Focus();
}
}
else
{
ChangeGiveTxt.Text = "";
}
}
private void AmountGiveTxt_Validating(object sender, CancelEventArgs e)
{
if (AmountGiveTxt.Text != "" && GrossTxt.Text != "")
{
if (!(Convert.ToSingle(GrossTxt.Text) <= Convert.ToSingle(AmountGiveTxt.Text)))
{
AmountGiveTxt.Text = "";
AmountGiveTxt.Focus();
}
else
{
float Given = Convert.ToSingle(AmountGiveTxt.Text);
float Return = Given - Convert.ToSingle(GrossTxt.Text);
ChangeGiveTxt.Text = Math.Round(Return, 2).ToString();
}
}
}