EmployeeInformationSystem

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 MySql.Data.MySqlClient;
namespace EmployeeInformation
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void Form1_Load(object sender, EventArgs e)
        {

        }

        private void btnAdd_Click(object sender, EventArgs e)
        {
            string connection = "server=localhost;user id=root;password=;database=employeerecord";
            string query = "INSERT INTO tbl_employee(FIRSTNAME,MI,LASTNAME,GENDER,POSITION)VALUES('"+ this.FIRSTNAME.Text + "','" + this.MI.Text + "','" + this.LASTNAME.Text + "','" + this.GENDER.Text + "','" + this.POSITION.Text + "')";
            MySqlConnection conn = new MySqlConnection(connection);
            MySqlCommand cmd = new MySqlCommand(query, conn);
            MySqlDataReader dr;
            conn.Open();
            dr = cmd.ExecuteReader();
            MessageBox.Show("Successfully saved");
            conn.Close();
        }

        private void btnUpdate_Click(object sender, EventArgs e)
        {
            string connection = "server=localhost;user id=root;password=;database=employeerecord";
            string query = "UPDATE tbl_employee SET FIRSTNAME='" + this.FIRSTNAME.Text + "',MI='" + this.MI.Text + "',LASTNAME='" + this.LASTNAME.Text + "',GENDER='" + this.GENDER.Text + "',POSITION='" + this.POSITION.Text + "' WHERE EMPID='"+ this.EMPID.Text + "'";
            MySqlConnection conn = new MySqlConnection(connection);
            MySqlCommand cmd = new MySqlCommand(query, conn);
            MySqlDataReader dr;
            conn.Open();
            dr = cmd.ExecuteReader();
            MessageBox.Show("Record has been updated successfully");
            conn.Close();
        }

        private void btnDelete_Click(object sender, EventArgs e)
        {
            string connection = "server=localhost;user id=root;password=;database=employeerecord";
            string query = "DELETE FROM tbl_employee WHERE EMPID='"+ this.EMPID.Text + "'";
            MySqlConnection conn = new MySqlConnection(connection);
            MySqlCommand cmd = new MySqlCommand(query, conn);
            MySqlDataReader dr;
            conn.Open();
            dr = cmd.ExecuteReader();
            MessageBox.Show("Data has been succesfully deleted!!");
            conn.Close();
        }

        private void btnLoadData_Click(object sender, EventArgs e)
        {
            string connection = "server=localhost;user id=root;password=;database=apsystem";
            string query = "SELECT * FROM tbl_employee";
            MySqlConnection conn = new MySqlConnection(connection);
            MySqlCommand cmd = new MySqlCommand(query, conn);
            MySqlDataAdapter da = new MySqlDataAdapter();
            da.SelectCommand = cmd;
            DataTable dt = new DataTable();
            da.Fill(dt);
            dataGridView1.DataSource = dt;
        }
    }
}