private void button1_Click(object sender, EventArgs e)
        {
            try
            {
                if (textBox1.Text != null && textBox2.Text != null && textBox3.Text != null && comboBox1.SelectedIndex != -1)
                {
                    int    role = comboBox1.SelectedIndex;
                    string str  = "";

                    switch (role)
                    {
                    case 0:
                        str = "db_owner";
                        break;

                    case 1:
                        str = "DecanatRole";
                        break;

                    case 2:
                        str = "TeacherRole";
                        break;

                    case 3:
                        str = "StarostaRole";
                        break;

                    case 4:
                        str = "StudentRole";
                        break;
                    }
                    role++;

                    String     quertString = @"insert into _User (login, password, id_role) values ('" + textBox2.Text + "','" + textBox3.Text + "','" + role.ToString() + "');";
                    SqlCommand insert      = new SqlCommand(quertString, con);
                    con.Open();
                    insert.ExecuteNonQuery();
                    con.Close();

                    //СОЗДАНИЕ
                    String     quertString2 = @"EXEC sp_addlogin " + textBox2.Text + "," + textBox3.Text + ",UniverConnect";
                    SqlCommand create2      = new SqlCommand(quertString2, con);
                    con.Open();
                    create2.ExecuteNonQuery();
                    con.Close();
                    String     quertString3 = @"EXEC sp_adduser " + textBox2.Text + "," + textBox1.Text + "";
                    SqlCommand create3      = new SqlCommand(quertString3, con);
                    con.Open();
                    create3.ExecuteNonQuery();
                    con.Close();
                    String     quertString4 = @"EXEC sp_addrolemember " + str + "," + textBox1.Text + " ";
                    SqlCommand create4      = new SqlCommand(quertString4, con);
                    con.Open();
                    create4.ExecuteNonQuery();
                    con.Close();
                    MDIParent1 my = Application.OpenForms.OfType <MDIParent1>().Single();
                    my.UserRegistered();
                }
                else
                {
                    MessageBox.Show("Заполнены не все поля", "Ошибка");
                }
                this.Close();
            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.Message, "У вас недостаточно прав!");
            }
        }
        private void button1_Click(object sender, EventArgs e)
        {
            String ConnectString = "Integrated Security=false; User Id = " + textBox1.Text + "; Password = "******"; server= " + @"DESKTOP-FNK5TNL\MY" + "; Initial Catalog = " + "UniverConnect";
                //DESKTOP-FNK5TNL\MY, UniverConnect
            }
            else
            {
                ConnectString += "; server= " + textBox3.Text + "; Initial Catalog = " + textBox4.Text;
            }



            // Объявление новой переменной типа SqlConection
            SqlConnection con   = new SqlConnection(ConnectString);
            Exception     error = null; // Переменная, представляющая ошибки, появляющиеся во время выполнения приложения

            try
            {
                con.Open();      // Открытие подключения
            }
            catch (Exception ex) // При возникновении неполадок при подключении появится сообщение с информацией об ошибке
            {
                error = ex;      // Переменная error запоминает конкретную ошибку
                MessageBox.Show(string.Format("Error: {0}", ex.Message), "Error",
                                MessageBoxButtons.OK, MessageBoxIcon.Error);
            }
            finally
            {
                if (error == null) // Если переменная не изменилась, то ошибок при подключении не было и соединение с БД установлено
                {
                    SqlCommand    command = new SqlCommand($" sp_helpuser'{textBox1.Text}'", con);
                    SqlDataReader reader  = command.ExecuteReader();
                    reader.Read();
                    string a = reader["Rolename"].ToString();
                    reader.Close();


                    SqlCommand    command1 = new SqlCommand($" SELECT id_user FROM dbo._User WHERE(login = SUSER_SNAME())", con);
                    SqlDataReader reader1  = command1.ExecuteReader();
                    reader1.Read();
                    int id_user = Convert.ToInt32(reader1[0]);
                    reader1.Close();

                    SqlCommand    command2 = new SqlCommand($"SELECT  Changed.id_user FROM Changed where Changed.id_user = '******' ", con);
                    SqlDataReader reader2  = command2.ExecuteReader();
                    reader2.Read();

                    bool est = reader2.HasRows;
                    reader2.Close();
                    con.Close();
                    switch (a)
                    {
                    case "db_owner":
                        MDIParent1 mdi = new MDIParent1(con);
                        mdi.Show();
                        break;

                    case "DecanatRole": Decanat decanat = new Decanat();
                        decanat.Show(); break;

                    case "TeacherRole": Teacher teach = new Teacher(id_user, est, con);
                        teach.Show();
                        break;

                    case "StarostaRole":
                        Starosta starosta = new Starosta(con, id_user, est);
                        starosta.Show();

                        break;

                    case "StudentRole": Student stud = new Student(id_user, est, con);
                        stud.Show();
                        break;
                    }
                    con.Close();
                }
            }
        }
Exemple #3
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        private static void Program_OnCloudAppInit()
        {
            MDIParent1 thisForm = new MDIParent1();

            thisForm.Show();
        }