/// <summary>
/// Get user from users base by its idNumber.
/// </summary>
/// <param name="userId">User's idNumber</param>
/// <returns>User if exist, null pointer otherwise</returns>
public static User GetUserById(int userId)
{
DataBase db = DataBase.GetInstance();
db.SetConnections(Constants.PATH);
db.LoadUsers();
return(db.GetUserById(userId));
}
/// <summary>
/// Deletes a user from the database
/// </summary>
/// <param name="userId">id of the user to delete</param>
/// <returns>false if there is no such user in the database</returns>
public static bool DeleteUser(int userId)
{
bool success = false;
DataBase db = DataBase.GetInstance();
db.SetConnections(Constants.PATH);
db.LoadUsers();
success = db.Users.Remove(db.GetUserById(userId));
db.CommitUsers();
return(success);
}