Form Dokter

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.OleDb;

namespace Prasetiyo
{
    public partial class FrmDokter : Form
    {
        public FrmDokter()
        {
            InitializeComponent();
        }

        void ambildata()
        {
            tyo.tbldokter.Clear();
            tyo.dadokter.Fill(tyo.tbldokter);
        }

        void bersih()
        {
            tbkodedokter.Clear();
            tbnamadokter.Clear();
            cbspesialis.SelectedIndex = -1;
            tbtelpon.Clear();
            cbpilihan.SelectedIndex = -1;
            tbcari.Clear();
            tbkodedokter.Focus();
        }

        private void FrmDokter_Load(object sender, EventArgs e)
        {
            this.KeyPreview = true;

            tyo.con = tyo.konek_db();

            tyo.dadokter = new OleDbDataAdapter (" select*from dokter", tyo.con);
            ambildata();

            dataGridView1.DataSource = tyo.tbldokter;
            dataGridView1.ReadOnly = true;
            dataGridView1.AllowUserToAddRows = false;

            dataGridView1.Columns[0].HeaderText = "Kode Dokter";
            dataGridView1.Columns[0].Width = 50;
            dataGridView1.Columns[1].HeaderText = "Nama Dokter";
            dataGridView1.Columns[1].Width = 100;
            dataGridView1.Columns[2].HeaderText = "Spesialis";
            dataGridView1.Columns[2].Width = 100;
            dataGridView1.Columns[3].HeaderText = "Telpon";
            dataGridView1.Columns[3].Width = 100;
        }

        private void btsimpan_Click(object sender, EventArgs e)
        {
            tyo.cmd = new OleDbCommand
                 ("select * from dokter where kd_dokter ='" + tbkodedokter.Text + "'", tyo.con);
            tyo.dtr = tyo.cmd.ExecuteReader();

            if (tyo.dtr.HasRows)
            {
                MessageBox.Show("kode tersebut sudah ada", "pesan", MessageBoxButtons.OK, MessageBoxIcon.Exclamation);
                tbkodedokter.Clear();
                tbkodedokter.Focus();
            }

            else
            {
                tyo.cmd = new OleDbCommand
                    ("insert into dokter (kd_dokter,nm_dokter,spesialis,tlp)" +
                    "values(" +
                    "'" + tbkodedokter.Text + "'," +
                    "'" + tbnamadokter.Text + "'," +
                    "'" + cbspesialis.Text + "'," +
                    "'" + tbtelpon.Text + "')", tyo.con);
                tyo.cmd.ExecuteNonQuery();
                ambildata();

                MessageBox.Show("Data udah disimpan", "pesan",
                    MessageBoxButtons.OK,
                    MessageBoxIcon.Information);
                bersih();
            }
        }

        private void bthapus_Click(object sender, EventArgs e)
        {
            int brs;
            string kode;

            brs = dataGridView1.CurrentRow.Index;
            kode = dataGridView1[0, brs].Value.ToString();

            if (MessageBox.Show("Apakah kd_dokter =" + kode + "\n" +
                              "ingin dihapus?", "Pesan",
                    MessageBoxButtons.OKCancel,
                    MessageBoxIcon.Question) == DialogResult.OK)
            {

                tyo.cmd = new OleDbCommand
                    ("delete from dokter where kd_dokter='" + kode + "'", tyo.con);
                tyo.cmd.ExecuteNonQuery();
                ambildata();

                MessageBox.Show("Data sudah terhapus", "Pesan",
                   MessageBoxButtons.OK,
                   MessageBoxIcon.Information);
            }
        }

        private void btkoreksi_Click(object sender, EventArgs e)
        {
            if (btkoreksi.Text == "Koreksi")
            {
                btkoreksi.Text = "Simpan Perubahan";
                btsimpan.Enabled = false;
                bthapus.Enabled = false;
                tbkodedokter.Enabled = false;

                int brsh;
                brsh = dataGridView1.CurrentRow.Index;
                tbkodedokter.Text = dataGridView1[0, brsh].Value.ToString();
                tbnamadokter.Text = dataGridView1[1, brsh].Value.ToString();
                cbspesialis.Text = dataGridView1[2, brsh].Value.ToString();
                tbtelpon.Text = dataGridView1[3, brsh].Value.ToString();

            }
            else if (btkoreksi.Text == "Simpan Perubahan")
            {
                btkoreksi.Text = "Koreksi";
                btsimpan.Enabled = true;
                bthapus.Enabled = true;
                tbkodedokter.Enabled = true;

                tyo.cmd = new OleDbCommand
                    ("update dokter set " +
                    "nm_dokter ='" + tbnamadokter.Text + "'," +
                    "spesialis ='" + cbspesialis.Text + "'," +
                    "tlp='" + tbtelpon.Text + "' where " +
                    "kd_dokter   ='" + tbkodedokter.Text + "'", tyo.con);

                tyo.cmd.ExecuteNonQuery();
                ambildata();

                MessageBox.Show("Data sudah di Perbaharui", "Pesan",
                  MessageBoxButtons.OK,
                  MessageBoxIcon.Information);
                bersih();
            }
        }

        private void tbcari_TextChanged(object sender, EventArgs e)
        {
            if (cbpilihan.SelectedIndex == 0)
            {
                tyo.dadokter = new OleDbDataAdapter
                ("select * from dokter where kd_dokter like '%" +
                 tbcari.Text + "%'", tyo.con);
            }
            else if (cbpilihan.SelectedIndex == 1)
            {
                tyo.dadokter = new OleDbDataAdapter
                ("select * from dokter where nm_dokter like '%" +
                 tbcari.Text + "%'", tyo.con);
            }
            else if (cbpilihan.SelectedIndex == 2)
            {
                tyo.dadokter = new OleDbDataAdapter
                ("select * from dokter where spesialis like '%" +
                 tbcari.Text + "%'", tyo.con);
            }
            else if (cbpilihan.SelectedIndex == 3)
            {
                tyo.dadokter = new OleDbDataAdapter
                ("select * from dokter where tlp like '%" +
                 tbcari.Text + "%'", tyo.con);
            }

            ambildata();
        }

        private void cbpilihan_SelectedIndexChanged(object sender, EventArgs e)
        {
            tbcari.Focus();
        }

        private void bttutup_Click(object sender, EventArgs e)
        {
            if (MessageBox.Show("Apakah Anda yakin akan menutup menu Dokter?", "Pesan",
                  MessageBoxButtons.OKCancel,
                  MessageBoxIcon.Question) == DialogResult.OK)
                Close();
        }

        private void btbatal_Click(object sender, EventArgs e)
        {
            if (MessageBox.Show("Apakah Anda yakin akan membatalkan input data?", "Pesan",
                  MessageBoxButtons.OKCancel,
                  MessageBoxIcon.Question) == DialogResult.OK)

                bersih();
            tyo.dadokter = new OleDbDataAdapter
             ("select * from dokter", tyo.con);
             ambildata();
        }
    }
}