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How to generate random confirmation number? 

public string GenerateRandomCode(int length) { 
    string charPool = "ABCDEFGOPQRSTUVWXY1234567890ZabcdefghijklmHIJKLMNnopqrstuvwxyz";

    StringBuilder rs = new StringBuilder(); 
    Random random = new Random(); 
    for (int i = 0; i < length; i++) 
    { 
        rs.Append(charPool[(int)(random.NextDouble() * charPool.Length)]); 
    } 
    return rs.ToString(); }

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