Encryption Problem

[sunburnt]

Hello everyone, I'm having a problem with my Decryption specifically. It works swell, except that the first 8 bytes of whatever I decrypt are mangled...Try it yourself on a simple text file.
If you can help me out, please do!

/************************************
 Example of the problem.
************************************/

cEnc cDES = new cEnc(cEnc.ENCTYPE.eDES);
cDES.FileEncrypt("C:\\test.txt","C:\\testenc.txt");
cDES.FileDecrypt("C:\\testenc.txt","C:\\testdec.txt");



/************************************
 Encryption Class I'm working on.  Right now it just does DES.
************************************/
using System.IO;
using System.Security.Cryptography;

	public class cEnc
	{
		public enum ENCTYPE {
			eDES = 0x01, 
			eDSA = 0x02,
			eRC2 = 0x03,
			eRIJNDAEL = 0x04,
			eRSA = 0x05,
			eTRIPLEDES = 0x06
		};
	
		public ENCTYPE EncryptionType = ENCTYPE.eDES;


		public cEnc(ENCTYPE enctype)
		{
			EncryptionType = enctype;
		}

		public cEnc()
		{
		}


		private byte[] ToBytes( string  s)
		{
			return System.Text.Encoding.ASCII.GetBytes(s);
		}

		public void FileEncrypt(string szFileIn, string szFileOut)
		{
			if(!File.Exists(szFileIn))
				throw(new Exception("File Not Found: " + szFileIn));


			DESCryptoServiceProvider des = new DESCryptoServiceProvider();
			
			//later we'll let the user pick a key.
			ICryptoTransform DesEnc = des.CreateEncryptor(ToBytes("kitten21"),null);
			

			FileStream fsIn = new FileStream(szFileIn, FileMode.Open, FileAccess.Read);
			FileStream fsOut = new FileStream(szFileOut, FileMode.Create, FileAccess.ReadWrite);
			
			byte[] buffer = new byte[2048];

			CryptoStream cStream = new CryptoStream(fsOut, DesEnc, CryptoStreamMode.Write);
			
			long pos = 0;
			int BL = buffer.Length;

			while(pos <= fsIn.Length)
			{
				if (pos + BL > fsIn.Length)
				{
					int t = (int)(fsIn.Length - pos);
					fsIn.Read(buffer, 0, t);
					cStream.Write(buffer, 0, t);
				}
				else
				{
					fsIn.Read(buffer, 0, BL);
					cStream.Write(buffer, 0, BL);
				}
								
				pos += BL;
			}
			
			fsIn.Close();
			cStream.Close();
			fsOut.Close();
		}


		public void FileDecrypt(string szFileIn, string szFileOut)
		{
			if(!File.Exists(szFileIn))
				throw(new Exception("File Not Found: " + szFileIn));


			DESCryptoServiceProvider des = new DESCryptoServiceProvider();

			//later we'll let the user pick a key.
			ICryptoTransform DesEnc = des.CreateDecryptor(ToBytes("kitten21"),null);


			FileStream fsIn = new FileStream(szFileIn, FileMode.Open, FileAccess.Read);
			FileStream fsOut = new FileStream(szFileOut, FileMode.Create, FileAccess.Write);
			
			
			byte[] buffer = new byte[2048];

			CryptoStream cStream = new CryptoStream(fsIn, DesEnc, CryptoStreamMode.Read);
			
			long pos = 0;
			int BL = buffer.Length;

			while(pos <= fsIn.Length)
			{
				if (pos + BL > fsIn.Length)
				{
					int t = (int)(fsIn.Length - pos);
					cStream.Read(buffer, 0, t);
					fsOut.Write(buffer, 0, t);
				}
				else
				{
					cStream.Read(buffer, 0, BL);
					fsOut.Write(buffer, 0, BL);
				}					
				
				pos += BL;
			}
			
			fsIn.Close();
			cStream.Close();
			fsOut.Close();
		}
	}
}