Why is ID ignored?

Question

C++ / C#

Hello.
The ID is ignored when added to the table.
Table:
Add code:
Constantly trying to add a user with ID'om = 0, what's the problem? (I first thought about int ?, but no, it doesn’t even work with int).
The error is something like this: Duplicate entry '0' for key 'PRIMARY'

Answer 1

[DatabaseGenerated(DatabaseGeneratedOption.None)]
public int ID { get; set; }

Answer 2

Because the ID field is AUTO INCREMENT , i.e. the base itself manages it and you do not need to monitor it.