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Unique identifiers: alphanumeric
public static string AlphaNumeric()
{
string s = "abcdefghijklmnopqrstuvwxyz0123456789";
StringBuilder builder = new StringBuilder();
Random random = new Random();
for (int i = 0; i < 4; i++)
{
int index = _random.Next(1, 36);
builder.Append(s[index]);
}
return builder.ToString();
}
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