How to convert GUID to Integer in C#

 To convert GUID to integer without data loss, we cannot use Int32 or Int64.

.NET 4.0 introduced BigInteger struct which is 128 bit integer, and GUID can be easily converted to BigInteger as follows.

For example:

// ex: 6172d469-3e9e-4234-bc53-b90f77212d24  
Guid g = Guid.NewGuid();
Console.WriteLine(g);
// Convert GUID to BigInteger
// ex: 48086539959425620223526443617323504745
BigInteger bigInt = new BigInteger(g.ToByteArray());
Console.WriteLine(bigInt);

g.ToByteArray() converts the GUID to a 16-byte array.