Check Number is Palindrome or not with Windows Form in C#

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;

namespace chaeck_palindrome
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}

private void button1_Click(object sender, EventArgs e)
{
int n, r, sum = 0, temp;

n = int.Parse(getnum.Text);
temp = n;
while (n > 0)
{
r = n % 10;
sum = (sum * 10) + r;
n = n / 10;
}
if (temp == sum)
lbldisplay.Text = "Output: Number is Palindrome.";
else
lbldisplay.Text = "Output: Number is not Palindrome";
}
}
}