// Check if the new ID already exists.
internal bool IsUnique(IdNumber num)
{
var ret = db.IdNumbers.Find(num.Id);
if (ret == null)
{
return(true);
}
return(false);
}
// Generate random ID number string.
internal string GanerateId()
{
var rand = new Random();
IdNumber generatedID;
do
{
generatedID = new IdNumber(rand.Next(10000, 999999999).ToString());
} while (!IsUnique(generatedID));
// Add to DB.
db.IdNumbers.Add(generatedID);
db.SaveChanges();
return(generatedID.Id.ToString());
}