private void button1_Click(object sender, EventArgs e) { try { string email = textBox1.Text; string password = textBox2.Text; if (email == string.Empty) { MessageBox.Show("Please enter your email"); return; } if (password == string.Empty) { MessageBox.Show("Please enter your password"); return; } Receptionist r = new Receptionist(); r.Email1 = email; r.Password1 = password; int result = r.AddPerson(r); if (result > 0) { textBox1.Text = ""; textBox2.Text = ""; if (email == "pinar" && password == "2317") { MessageBox.Show("Welcome Pınar"); EmployeeScreen Employees = new EmployeeScreen(); Employees.Show(); this.Hide(); } else if (email == "seyma" && password == "0506") { MessageBox.Show("Welcome Şeyma"); EmployeeScreen Employees = new EmployeeScreen(); Employees.Show(); this.Hide(); } else if (email == "hilal" && password == "2525") { MessageBox.Show("Welcome Hilal"); EmployeeScreen Employees = new EmployeeScreen(); Employees.Show(); this.Hide(); } else { MessageBox.Show("Please try again"); } } } catch (Exception ex) { MessageBox.Show(ex.Message); } }