String Encryption

using System.Security.Cryptography;

using System.IO;

static string EncrypData;

static byte[] bytes =System.Text.ASCIIEncoding.ASCII.GetBytes("AbCdEfGh");

private void buttonEncrypt_Click(object sender, EventArgs e)

{

try

{

DESCryptoServiceProvider cryptoProvider = new DESCryptoServiceProvider();

MemoryStream memoryStream = new MemoryStream();

CryptoStream cryptoStream = new CryptoStream(memoryStream, cryptoProvider.CreateEncryptor(bytes, bytes), CryptoStreamMode.Write);

StreamWriter writer = new StreamWriter(cryptoStream);

writer.Write(textBox1.Text);

writer.Flush();

cryptoStream.FlushFinalBlock();

writer.Flush();

EncrypData = Convert.ToBase64String(memoryStream.GetBuffer(), 0, (int)memoryStream.Length);

StreamWriter sw = new StreamWriter(@"C:\MyEncryption.DAT");

sw.Write(EncrypData);

sw.Flush();

sw.Close();

}

catch (Exception ex)

{

MessageBox.Show(ex.Message);

}

}

private void buttonDecrypt_Click(object sender, EventArgs e)

{

try

{

DESCryptoServiceProvider cryptoProvider = new DESCryptoServiceProvider();

MemoryStream memoryStream = new MemoryStream(Convert.FromBase64String(EncrypData));

CryptoStream cryptoStream = new CryptoStream(memoryStream, cryptoProvider.CreateDecryptor(bytes, bytes), CryptoStreamMode.Read);

StreamReader reader = new StreamReader(cryptoStream);

StreamWriter sw = new StreamWriter(@"C:\MyDecrypt.DAT");

sw.Write(reader.ReadToEnd());

sw.Flush();

sw.Close();

}

catch (Exception ex)

{

MessageBox.Show(ex.Message);

}

}