// Check if the EGN is valid
private static string IsValid(long input)
{
long lastNumber = input % 10;
long numbersToCheck = input / 10;
var arr = digitArr(numbersToCheck);
var arrsResult = controlNumberCalculation(arr);
var divideByEleven = (long)arrsResult / 11;
var controlNumber = (long)arrsResult - divideByEleven * 11;
if (controlNumber >= 10)
{
controlNumber = 0;
}
if (controlNumber == lastNumber)
{
return(ValidationService.validEgn());
}
else
{
return(ErrorService.invalidEgnError());
}
}
private static string egnAuthorization(string egn)
{
long input;
bool validInput = long.TryParse(egn, out input);
if (input != 0)
{
var inputArray = digitArr(input);
if (inputArray.Length < 10)
{
return(ErrorService.lessThanTenDigitsError());
}
if (inputArray.Length > 10)
{
return(ErrorService.moreThanTenDigitsError());
}
}
else
{
return(ErrorService.invalidInputError());
}
return(IsValid(input));
}