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Test whether a given number enter to textbox in valid integer or an invalid integer

Posted By:satyapriyanayak       Posted Date: September 01, 2014    Points: 40    Category: Visual Studio    URL: http://www.dotnetspark.com  

In this Code Snippets we will know how to test whether a given number enter to textbox in valid integer or an invalid integer.

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 Valid_or_Invalid_integer
    public partial class Form1 : Form
        public Form1()

        private void btn_valid_invalid_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 again!");
                MessageBox.Show("Valid integer");


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