DigitalWorld_08/Avtorization.cs

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Data.SqlClient;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace Digital_World_08
{
    public partial class Avtorization : Form
    {
        public Avtorization()
        {
            InitializeComponent();
        }

        private void button1_Click(object sender, EventArgs e)
        {
            string username = LoginBox.Text;
            string password = PasswordBox.Text;

            // Подключение к базе данных
            SqlConnection conn = new SqlConnection("Data Source=class31000;Initial Catalog=digital_world_8;Integrated Security=True");
            conn.Open();
            // Поиск пользователя в базе данных
            SqlCommand cmd = new SqlCommand("SELECT Role FROM Users WHERE Username=@username AND Password=@password", conn);
            cmd.Parameters.AddWithValue("@username", username);
            cmd.Parameters.AddWithValue("@password", password);

            SqlDataReader reader = cmd.ExecuteReader();
            if (reader.HasRows)
            {
                // Авторизация прошла успешно
                reader.Read();
                int role = reader.GetInt32(0);
                if (role == 1)
                {
                    this.Hide();
                    Administrator administrator = new Administrator();
                    administrator.Show();
                }
                else if (role == 2)
                {
                    this.Hide();
                    Master master = new Master();
                    master.Show();
                }
                else if (role == 3)
                {

                    this.Hide();
                    Maneger maneger = new Maneger();
                    maneger.Show();
                }
            }
            else
            {
                // Неверный логин или пароль
            }

            conn.Close();
        }

    }
}