blank guid code example
Example 1: guid.empty
00000000-0000-0000-0000-000000000000
Example 2: empty guid
Guid newId = Guid.Empty; // 00000000-0000-0000-0000-000000000000
00000000-0000-0000-0000-000000000000
Guid newId = Guid.Empty; // 00000000-0000-0000-0000-000000000000