private void button_LOGIN_Click(object sender, EventArgs e) { if (txtUsername.Text.Equals("") || txtPassword.Text.Equals("")) { return; } else { dbDangNhap.Decrypt(txtUsername.Text.Trim()); DataSet ds = dbDangNhap.FindUser(txtUsername.Text, txtPassword.Text); dbDangNhap.Encrypt(txtUsername.Text.Trim()); if (ds.Tables[0].Rows.Count > 0) { DataSet ds1 = dbNhanVien.LayChucVuNV(txtUsername.Text); if (ds1.Tables[0].Rows.Count > 0) { Program.ChucVuUser = ds1.Tables[0].Rows[0].ItemArray[0].ToString(); Program.UserName = txtUsername.Text; this.Hide(); User us = new User(); us.MaNV = txtUsername.Text.Trim(); Form1 mainform = new Form1(us.MaNV); mainform.ShowDialog(); this.Close(); //this.ShowInTaskbar = false; } else { MessageBox.Show("Đăng nhập thât bại", "Thông báo!!", MessageBoxButtons.OK, MessageBoxIcon.Information); return; } } } }