palindromes in C#

Write a program that find palindromes. The GUI of program is given to you.
Input words in first text-box and the palindromes should be printed in second
text-box by pressing the button.

Solution

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 Palindrome
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }
        private void buttonClear_Click(object sender, EventArgs e)
        {
            
        }
        private void buttonGenerate_Click(object sender, EventArgs e)
        {
            string rtb;
            string palin="";
            string tempString,tempString2,testString="";
            //char[] temp;
            //int i = 0;
            rtb = words.Text+"\n";
            foreach (char c in rtb)
            {
                testString += Convert.ToString(c);
                if (c == '\n')
                {
                    char[] temp = palin.ToCharArray();
                    tempString2 = new string(temp);
                    Array.Reverse(temp);
                    tempString = new string(temp);
                    if (tempString == tempString2)
                    {
                        tempString += "\n";
                        palindrome.Text += tempString;
                    }
                    else
                    {
                        palindrome.Text += "\n";
                    }
                    palin = "";
                }
                else if (c != '\n')
                {
                    palin += Convert.ToString(c);
                }
            }
        }

        private void Form1_Load(object sender, EventArgs e)
        {

        }

        private void button1_Click(object sender, EventArgs e)
        {
            words.Clear();
           palindrome.Clear();
        }
    }
}