Code not working

Question

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; using System.IO;   using System.Security.Cryptography;   namespace WindowsFormsApplication1 {     public partial class Form1 : Form     {         public Form1()         {             InitializeComponent();         }           private void button2_Click(object sender, EventArgs e)         {             RSACryptoServiceProvider myrsa = new RSACryptoServiceProvider();             System.Text.ASCIIEncoding encoding = new System.Text.ASCIIEncoding();                          openFileDialog1.Title = "Insert Image";              openFileDialog1.ShowDialog();             openFileDialog1.Filter = "JPEG Images|*.jpg|GIF Images|*.gif";               object r = new object();             EventArgs en = new EventArgs();               string s1 = richTextBox1.Text;             string s2 = richTextBox2.Text;             string s3 = richTextBox3.Text;               string Chosen_File = "";             Chosen_File = openFileDialog1.FileName;             pictureBox1.Image = Image.FromFile(Chosen_File);                          byte[] byteData = imageToByteArray(pictureBox1.Image);             string ToS1 = byteData.ToString();                          Byte[] newdata = encoding.GetBytes(ToS1);             Byte[] encrypted = myrsa.Encrypt(newdata, false);               for (int i = 0; i < encrypted.Length; i++)                 richTextBox4.Text += encrypted[i].ToString();                                         Byte[] decrypted = myrsa.Decrypt(encrypted, false);//decrypt              pictureBox2.Image = byteArrayToImage(decrypted);                               }         public byte[] imageToByteArray(System.Drawing.Image imageIn)         {             MemoryStream ms = new MemoryStream();             imageIn.Save(ms, System.Drawing.Imaging.ImageFormat.Jpeg);             return ms.ToArray();         }           public Image byteArrayToImage(byte[] byteArrayIn)         {             Stream ms = new MemoryStream(byteArrayIn);             Image returnImage = Image.FromStream(ms);             return returnImage;         }                     }      }



The error is in function byteArrayToImage :: Parameter is not valid.