Insert into mySql table with C#

using System;
	using System.Collections.Generic;
	using System.ComponentModel;
	using System.Data;
	using System.Drawing;
	using System.Linq;
	using System.Text;
	using System.Windows.Forms;
	using MySql.Data.MySqlClient;
	private void cmdAdd_Click(object sender, EventArgs e)
	{
	MySqlConnection conn=new MySqlConnection();
	MySqlCommand cmd = new MySqlCommand();
	string myConnectionString;
	string cmdString;
	myConnectionString = "server=127.0.0.1; uid=root; pwd=xxxxxx; database=test";
	cmdString = "insert into t_students(AdmNo,FirstName,LastName) values('" + txtAdmNo.Text + "','" +                          txtFirstName.Text + "','" + txtLastName.Text + "');";
	try
	{
	conn.ConnectionString = myConnectionString;
	conn.Open();
	cmd.Connection = conn;
	cmd.CommandText = cmdString;
	cmd.ExecuteNonQuery();
	MessageBox.Show("Record successfully added.");
	}
	catch (MySqlException ex)
	{
	MessageBox.Show(ex.Message);
	}
	finally
	{
	conn.Dispose();
	}
	} ============================================= table definition create table t_students (     AdmNo int unsigned not null, FirstName varchar(30) not null, LastName varchar(30) not null ); ====================================