کار با GUID در CSharp

1public static Guid NewGuid()
2{
3    return Guid.NewGuid();
4}

 1public static Guid NewSequentialGuid()
 2{
 3    var uid = Guid.NewGuid().ToByteArray();
 4    var binDate = BitConverter.GetBytes(DateTime.UtcNow.Ticks);
 5
 6    var secuentialGuid = new byte[uid.Length];
 7
 8    secuentialGuid[0] = uid[0];
 9    secuentialGuid[1] = uid[1];
10    secuentialGuid[2] = uid[2];
11    secuentialGuid[3] = uid[3];
12    secuentialGuid[4] = uid[4];
13    secuentialGuid[5] = uid[5];
14    secuentialGuid[6] = uid[6];
15
16    // set the first part of the 8th byte to '1100' so     
17    // later we'll be able to validate it was generated by us   
18
19    secuentialGuid[7] = (byte)(0xc0 | (0xf & uid[7]));
20
21    // the last 8 bytes are sequential,    
22    // it minimizes index fragmentation   
23    // to a degree as long as there are not a large    
24    // number of Secuential-Guids generated per millisecond  
25
26    secuentialGuid[9] = binDate[0];
27    secuentialGuid[8] = binDate[1];
28    secuentialGuid[15] = binDate[2];
29    secuentialGuid[14] = binDate[3];
30    secuentialGuid[13] = binDate[4];
31    secuentialGuid[12] = binDate[5];
32    secuentialGuid[11] = binDate[6];
33    secuentialGuid[10] = binDate[7];
34
35    return new Guid(secuentialGuid);
36}

1public static bool IsGuid(string guidString)
2{
3    return Guid.TryParse(guidString, out _);
4}

1public static bool IsEmptyGuid(Guid guid)
2{
3    return guid == Guid.Empty;
4}