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Generating serial numbers and keys in Asp.net(C#).

here we are using GUID for generate serial numbers and GUID is always unique.

Example format: XXXX-XXXX-XXXX-XXXX-XXXX-XXXX-XXXX.

Guid SerialKeyGuid = Guid.NewGuid();
string AccessKey = SerialKeyGuid.ToString("N");
string AccessKeyLength = AccessKey.Substring(0, 28).ToUpper();
char[] serialArray = AccessKeyLength.ToCharArray();
string SerialNumber = "";
int P = 0;
for (int B = 0; B < 28; B++)
{
                for (P = B; P < 4 + B; P++)
                {
                    SerialNumber += serialArray[P];
                }
                if (P == 28)
                {
                    break;
                }
                else
                {
                     B = (P) - 1;
                     SerialNumber += "-";
                }
}
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