Error Provider Window Application in C#.Net

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.Diagnostics;
using System.ComponentModel;
using System.Text;

namespace Error2
{
    public partial class Form1 : Form
    {

        public Form1()
        {
            InitializeComponent();
        }

        private void button1_Click(object sender, EventArgs e)
        {
            if (textBox1.Text == "krishna")
            {
                errorProvider1.Clear();
                MessageBox.Show("This is Valid Data");

            }
            else
            {
                errorProvider1.SetError(textBox1,"please enter correct data");
                MessageBox.Show("please enter correct data");
                errorProvider1.BlinkStyle = ErrorBlinkStyle.BlinkIfDifferentError;

            }
        }
    }
}