private int CheckSum()
{
int checksum = 0;
int value = 1;
string groupCode = GroupCode.ToString();
foreach (var letter in groupCode)
{
var number = int.Parse(letter.ToString());
checksum += number * value;
value = value == 1 ? 3 : 1;
}
string editorCode = EditorCode.ToString();
foreach (var letter in editorCode)
{
var number = int.Parse(letter.ToString());
checksum += number * value;
value = value == 1 ? 3 : 1;
}
string published = Published.ToString();
foreach (var letter in editorCode)
{
var number = int.Parse(letter.ToString());
checksum += number * value;
value = value == 1 ? 3 : 1;
}
return(checksum = 10 - (checksum % 10));
}
private string PublishedWithZeros()
{
int length = 3 + GroupCode.ToString().Length + EditorCode.ToString().Length + Published.ToString().Length;
string publishedWithZeros = "";
for (int i = 0; i < 12 - length; i++)
{
publishedWithZeros += "0";
}
return(publishedWithZeros + Published);
}
