KazarinDE_03/KazarinDE/Form1.cs

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

namespace KazarinDE
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        

        private void textBox2_TextChanged(object sender, EventArgs e)
        {

        }

        private void checkBox1_CheckedChanged(object sender, EventArgs e)
        {
            if (checkBox1.Checked)
            {
                textBox2.PasswordChar = '\0';
            }
            else
            {
                textBox2.PasswordChar = '●';
            }
        }

        private void pictureBox1_Click(object sender, EventArgs e)
        {

        }

        private void textBox1_TextChanged(object sender, EventArgs e)
        {

        }

        private void label2_Click(object sender, EventArgs e)
        {

        }

        private void label1_Click(object sender, EventArgs e)
        {

        }

        private void button1_Click(object sender, EventArgs e)
        {
            string username = textBox1.Text;
            string password = textBox2.Text;
            SqlConnection conn = new SqlConnection(@"Data Source=Class31000;Initial Catalog=KazarinDE_03;Integrated Security=True");
            conn.Open();
            SqlCommand cmd = new SqlCommand("SELECT Роли, Статус FROM Сотрудники WHERE Username=@username AND Password=@password", conn);
            cmd.Parameters.AddWithValue("@username", username);
            cmd.Parameters.AddWithValue("@password", password);

            SqlDataReader reader = cmd.ExecuteReader();
            if (reader.HasRows)
            {
                reader.Read();
                int Roles = reader.GetInt32(0);
                int status = reader.GetInt32(1);
                if (status == 1)
                {
                    if (Roles == 1)
                    {
                        Form2 administrator = new Form2();
                        administrator.Show();
                        this.Hide();
                    }
                    else if (Roles == 2)
                    {
                        Form3 waiters = new Form3();
                        waiters.Show();
                        this.Hide();
                    }
                    else if (Roles == 3)
                    {
                        Form4 cooks = new Form4();
                        cooks.Show();
                        this.Hide();
                    }

                }
                else
                {
                    MessageBox.Show("Отказано в доступе");
                }
            }

        }
    }
}