void TbxPropPriceIn_TextChanged(object sender, EventArgs e)
{
Regex regexPriceIn = new Regex(@"^[A-Z]{3}$");
if (regexPriceIn.IsMatch(tbxPropPriceIn.Text))
{
tbxPropPriceIn.ForeColor = colorText;
SetAcountExchangeRate();
}
else
{
tbxPropPriceIn.ForeColor = Color.Red;
}
return;
}