How to check whether we enter integer value in textbox [Resolved]

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;



namespace

{

    public partial class Form3 : Form

    {

        public Form3()

        {

            InitializeComponent();

        }



        private void button1_Click(object sender, EventArgs e)

        {

            int i;



            bool isValidInteger = int.TryParse(textBox1.Text, out i);



            if (!isValidInteger)

            {

                MessageBox.Show("Not a valid integer. Please enter once more");

                textBox1.Focus();

                return;

            }

            else

            {

                MessageBox.Show("valid integer");

                textBox1.Focus();

            }

        }

    }

}

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