Steganography.cs

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using System;
using System.Drawing;
using System.Windows.Forms;
using System.Drawing.Imaging;
using System.IO;
//www.51aspx.com
namespace Steganography
{
    public partial class Steganography : Form
    {
        private Bitmap bmp = null;
        private string extractedText = string.Empty;

        public Steganography()
        {
            InitializeComponent();
        }

        private void hideButton_Click(object sender, EventArgs e)
        {
            bmp = (Bitmap)imagePictureBox.Image;

            string text = dataTextBox.Text;

            if (text.Equals(""))
            {
                MessageBox.Show("The text you want to hide can't be empty", "Warning");

                return;
            }

            if (encryptCheckBox.Checked)
            {
                if (passwordTextBox.Text.Length < 6)
                {
                    MessageBox.Show("Please enter a password with at least 6 characters", "Warning");

                    return;
                }
                else
                {
                    text = Crypto.EncryptStringAES(text, passwordTextBox.Text);
                }
            }

            bmp = SteganographyHelper.embedText(text, bmp);

            MessageBox.Show("Your text was hidden in the image successfully!", "Done");

            notesLabel.Text = "Notes: don't forget to save your new image.";
            notesLabel.ForeColor = Color.OrangeRed;
        }

        private void extractButton_Click(object sender, EventArgs e)
        {
            bmp = (Bitmap)imagePictureBox.Image;

            string extractedText = SteganographyHelper.extractText(bmp);

            if (encryptCheckBox.Checked)