How to encrypt and decrypt a string using C# in Visual Studio 2005

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C#

cryptography

Hi,

I wanna do encryption and decryption of a string in C# Visual Studio 2005. I did some search on google and got a code in VB.Net, and I converted it to C#. But its returning this string while encrypting... "Specified key is not a valid size for this algorithm.". Can anybody help me please. is this the right way in Visual Studio 2005 ?
Here is the code...

public static string Decrypt(string encryptedText)
      {
          byte[] rgbIV = { 0x21, 0x43, 0x56, 0x87, 0x10, 0xfd, 0xea, 0x1c };

          try
          {
              byte[] key = Encoding.UTF8.GetBytes("A0D1X0Q");
              DESCryptoServiceProvider des = new DESCryptoServiceProvider();
              byte[] inputByteArray = Convert.FromBase64String(encryptedText.Replace(' ', '+'));
              MemoryStream ms = new MemoryStream();
              CryptoStream cs = new CryptoStream(ms, des.CreateDecryptor(key, rgbIV), CryptoStreamMode.Write);
              cs.Write(inputByteArray, 0, inputByteArray.Length);
              cs.FlushFinalBlock();
              Encoding encoding = Encoding.UTF8;
              return encoding.GetString(ms.ToArray());
          }
          catch (Exception e)
          {
              return e.Message;
          }
      }
      public static string Encrypt(string stringToEncrypt)
      {
          byte[] inputByteArray = Encoding.UTF8.GetBytes(stringToEncrypt);
          byte[] rgbIV = { 0x21, 0x43, 0x56, 0x87, 0x10, 0xfd, 0xea, 0x1c };
          try
          {
              byte[] key = Encoding.UTF8.GetBytes("A0D1X0Q");
              DESCryptoServiceProvider des = new DESCryptoServiceProvider();
              MemoryStream ms = new MemoryStream();
              CryptoStream cs = new CryptoStream(ms, des.CreateEncryptor(key, rgbIV), CryptoStreamMode.Write);
              cs.Write(inputByteArray, 0, inputByteArray.Length);
              cs.FlushFinalBlock();
              return Convert.ToBase64String(ms.ToArray());
          }
          catch (Exception e)
          {
              return e.Message;
          }
      }