using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
public class User
{
public int id;
public string username;
public string nickname;
public string password;
}
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
public class User
{
public int id;
public string username;
public string nickname;
public string password;
}