[Jakarin Chawachat]

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  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 db
  {
    public partial class Form1 : Form
    {
        private MySqlConnection connection;
        private string server;
        private string database;
        private string uid;
        private string password;
        public Form1()
        {
            InitializeComponent();
            server = "localhost";
            database = "connectcsharptomysql";
            uid = "root";
            password = "chung";
            string connectionString;
            connectionString = "SERVER=" + server + ";" + "DATABASE=" +
            database + ";" + "UID=" + uid + ";" + "PASSWORD=" + password + ";";
            connection = new MySqlConnection(connectionString);
        }
        private bool OpenConnection()
        {
            try
            {
                connection.Open();
                return true;
            }
            catch (MySqlException ex)
            {
                //When handling errors, you can your application's response based 
                //on the error number.
                //The two most common error numbers when connecting are as follows:
                //0: Cannot connect to server.
                //1045: Invalid user name and/or password.
                switch (ex.Number)
                {
                    case 0:
                        MessageBox.Show("Cannot connect to server.  Contact administrator");
                        break;
                    case 1045:
                        MessageBox.Show("Invalid username/password, please try again");
                        break;
                }
                return false;
            }
        }
        //Close connection
        private bool CloseConnection()
        {
            try
            {
                connection.Close();
                return true;
            }
            catch (MySqlException ex)
            {
                MessageBox.Show(ex.Message);
                return false;
            }
        }
        private void Form1_Load(object sender, EventArgs e)
        {
        }
        private void button1_Click(object sender, EventArgs e)
        {
            string query = "INSERT INTO tableinfo (name, age) VALUES('John Smith', '33')";
            //open connection
            if (this.OpenConnection() == true)
            {
                //create command and assign the query and connection from the constructor
                MySqlCommand cmd = new MySqlCommand(query, connection);
                //Execute command
                cmd.ExecuteNonQuery();
                //close connection
                this.CloseConnection();
            }
        }
        private void button2_Click(object sender, EventArgs e)
        {
            string query = "UPDATE tableinfo SET name='Joe', age='22' WHERE name='John Smith'";
            //Open connection
            if (this.OpenConnection() == true)
            {
                //create mysql command
                MySqlCommand cmd = new MySqlCommand();
                //Assign the query using CommandText
                cmd.CommandText = query;
                //Assign the connection using Connection
                cmd.Connection = connection;
                //Execute query
                cmd.ExecuteNonQuery();
                //close connection
                this.CloseConnection();
            }
        }
        private void button3_Click(object sender, EventArgs e)
        {
            string query = "DELETE FROM tableinfo WHERE name='John Smith'";
            if (this.OpenConnection() == true)
            {
                MySqlCommand cmd = new MySqlCommand(query, connection);
                cmd.ExecuteNonQuery();
                this.CloseConnection();
            }
        }
        private void button4_Click(object sender, EventArgs e)
        {            
            string query = "SELECT * FROM tableinfo";
            //Open connection
            if (this.OpenConnection() == true)
            {
                //Create Command
                MySqlCommand cmd = new MySqlCommand(query, connection);
                //Create a data reader and Execute the command
                MySqlDataReader dataReader = cmd.ExecuteReader();
                //Read the data and store them in the list
                while (dataReader.Read())
                {
                    textbox1.Text += dataReader["id"] + ""+dataReader["name"] + ""+dataReader["age"] + "\r\n";
                }
                //close Data Reader
                dataReader.Close();
                //close Connection
                this.CloseConnection();
                //return list to be displayed                
            }
        }
        private void button5_Click(object sender, EventArgs e)
        {
            string query = "SELECT Count(*) FROM tableinfo";
            int Count = -1;
            //Open Connection
            if (this.OpenConnection() == true)
            {
                //Create Mysql Command
                MySqlCommand cmd = new MySqlCommand(query, connection);
                //ExecuteScalar will return one value
                Count = int.Parse(cmd.ExecuteScalar() + "");
                //close Connection
                this.CloseConnection();
                MessageBox.Show(Count.ToString());
            }
        }
    }
  }
[Jakarin Chawachat]

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