prelastconk/testkonkurs1/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 testkonkurs1
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void sing_in_Click(object sender, EventArgs e)
        {
            string connString = "Data Source=DESKTOP-Q8BTJMH;Initial Catalog=Testkonkurs;Integrated Security=True";
            SqlConnection conn = new SqlConnection(connString);
            SqlCommand command = new SqlCommand("SELECT * FROM users WHERE login = @login AND password = @password", conn);
            command.Parameters.AddWithValue("@login", login.Text);
            command.Parameters.AddWithValue("@password", password.Text);
            conn.Open();
            SqlDataReader Reader = null;
            try
            {
                Reader = command.ExecuteReader();
                if (Reader.HasRows)
                {
                    Reader.Read();
                    int rols = 0;
                    if((Reader["admin"].ToString()) == "1" &&(adminCheck.Checked))
                    {
                        Form2 fr2 = new Form2();
                        fr2.Show();
                        this.Hide();
                        rols = 1;
                    }


                    if ((Reader["manager"].ToString() == "1")&& (managerCheck.Checked))
                    {
                        Form3 fr3 = new Form3();
                        fr3.Show();
                        this.Hide();
                        rols = 1;
                    }

                    if (rols == 0)
                    {
                        MessageBox.Show("Выбрана неправильная роль", "ошибка авторизации", MessageBoxButtons.OK, MessageBoxIcon.Information);
                    }

                }
                else
                {
                    MessageBox.Show("Неправильно введен логин или пароль", "ошибка авторизации", MessageBoxButtons.OK, MessageBoxIcon.Information);
                }
            }
            catch(Exception ex)
            {
                MessageBox.Show(ex.Message.ToString(),"", MessageBoxButtons.OK, MessageBoxIcon.Error);
            }
        }

        private void password_TextChanged(object sender, EventArgs e)
        {

        }

        private void login_Enter(object sender, EventArgs e)
        {
            if(login.Text == "Введите логин")
            {
                login.Text = "";
            }
        }

        private void login_Leave(object sender, EventArgs e)
        {
            if (login.Text == "")
            {
                login.Text = "Введите логин";
            }
        }

        private void password_Enter(object sender, EventArgs e)
        {
            if (password.Text == "Введите пароль")
            {
                password.Text = "";
            }
        }

        private void password_Leave(object sender, EventArgs e)
        {
            if (password.Text == "")
            {
                password.Text = "Введите пароль";
            }
        }
    }
}