private void btnLogin_Click(object sender, EventArgs e) { // Receptionsit (Username/Password): (Thang_UIT / t) hoặc (hongthuy / t) // Manager (Username/Password): (Nghia_UIT / n) string Username = this.txtUsername.Text; string Password = this.txtPassword.Text; if (string.IsNullOrWhiteSpace(txtUsername.Text) == true || string.IsNullOrWhiteSpace(txtPassword.Text) == true) { MessageBox.Show("Please enter your full username and password!", "NOTIFICATION", MessageBoxButtons.OK, MessageBoxIcon.Information); } else { try { if (bus_acc.Get_Role(Username, Password).Rows[0][0].ToString().Equals("Receptionist")) { MessageBox.Show("Hello Receptionist!", "NOTIFICATION", MessageBoxButtons.OK, MessageBoxIcon.Information); DataTable RecID = bus_acc.Display_RecID(Username, Password); Receptionist_Screen Receptionist = new Receptionist_Screen(RecID); this.Hide(); Receptionist.ShowDialog(); this.Show(); } else if (bus_acc.Get_Role(Username, Password).Rows[0][0].ToString().Equals("Manager")) { MessageBox.Show("Hello my Boss!", "NOTIFICATION", MessageBoxButtons.OK, MessageBoxIcon.Information); Manager_Screen Manager = new Manager_Screen(); this.Hide(); Manager.ShowDialog(); this.Show(); } } catch { MessageBox.Show("Username or Password not correct! Please enter again.", "NOTIFICATION", MessageBoxButtons.OK, MessageBoxIcon.Warning); } } }