private bool IsFormValid()
{
if ((!string.IsNullOrEmpty(NameOnCard)) && (!string.IsNullOrEmpty(CardNumber)) && (!string.IsNullOrEmpty(CVC)) && (!string.IsNullOrEmpty(ExpiryDate)) && (!string.IsNullOrEmpty(ZipCode)))
{
Regex nameRegex = new Regex(@"^[\w\s]*$");
Regex monthRegex = new Regex(@"^(0[1-9]|1[0-2])$");
Regex yearRegex = new Regex(@"^(19|20)\d{2}$");
if (!nameRegex.IsMatch(NameOnCard))
{
Message = "Name is invalid";
return(false);
}
if ((CardNumber.Length < 15) || (CardNumber.Length > 16))
{
Message = "Credit card number length is invalid";
return(false);
}
if (!long.TryParse(CardNumber, out _cardNumberLong))
{
Message = "Credit card number is invalid";
return(false);
}
if (!CVC.Length.Equals(3))
{
Message = "CVC is inavlid";
return(false);
}
if (!Int32.TryParse(CVC, out _cvcInt))
{
Message = "CVC is invalid";
return(false);
}
if (ExpiryDate.Contains("/"))
{
string month = ExpiryDate.Split('/')[0];
string year = ExpiryDate.Split('/')[1];
if ((!monthRegex.IsMatch(month)) || (!yearRegex.IsMatch(year)))
{
Message = "Invalid expiration date";
return(false);
}
else
{
if ((!Int32.TryParse(month, out int monthInt)) || (!Int32.TryParse(year, out int yearInt)))
{
Message = "Invalid expiration date";
return(false);
}
}
}
else
{
Message = "Invalid expiration date";
return(false);
}
if (!ZipCode.Length.Equals(5))
{
Message = "Zip Code length is invalid";
return(false);
}
if (!Int32.TryParse(ZipCode, out _zipCodeInt))
{
Message = "Zip Code is invalid";
return(false);
}
Message = string.Empty;
return(true);
}
else
{
return(false);
}
}