static string GenerateID()
{
int strlen = 15;
char[] chars = {'a','b','c','d','e','f','g','h','i','j','k','l','m','n','o','p','q','r','s','t','u','v','w','x','y','z','A','B','C','D','E','F','G','H','I','J','K','L','M','N','O','P','Q','R','S','T','U','V','W','X','Y','Z','0','1','2','3','4','5','6','7','8'};
int num_chars = chars.Length - 1;
string randomChar = "";
for (int i = 0; i < strlen; i++) {
randomChar += chars[(int)Mathf.Floor(UnityEngine.Random.Range(0,num_chars))];
}
return randomChar;
}