Encrypt and Decrypt text file

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ASP.NET

When I try to return the value in bytes in the decrypt after the encrytion is done, it gives an error as "length of the data to decrypt is invalid."or"Bad Data"

The code is as follows

#region Decrypt

internal static byte[] Decrypt(string inFile)
{
    FileStream inFileStream = new FileStream(inFile, FileMode.Open, FileAccess.Read);
    MemoryStream outMemoryStream = new MemoryStream();
    TripleDESCryptoServiceProvider tdes = new TripleDESCryptoServiceProvider();
    Dictionary<string,> memDict = new Dictionary<string,>();
    CryptoStream cs = new CryptoStream(outMemoryStream, tdes.CreateDecryptor(Encoding.UTF8.GetBytes(sharedkey), sharedvector), CryptoStreamMode.Write);
    int bufferLen = 4096;
    byte[] buffer = new byte[bufferLen];
    //Convert.FromBase64String(buffer.Replace(" ", "+"));
    int bytesRead;
    do
    {
        // read a chunk of data from the input file
        bytesRead = inFileStream.Read(buffer, 0, bufferLen);
        // encrypt it
        cs.Write(buffer, 0, bytesRead);
    } while (bytesRead != 0);

    // close everything
    // this will also close the unrelying fsOut stream

    //byte[] cipherTextBytes = Convert.FromBase64String(cipherText.Replace(" ", "+"));
    //string strDecrypted = Decrypt(strToDecrypt.Replace(" ","+"),_privateKey);
    cs.FlushFinalBlock();
    cs.Close();
    inFileStream.Close();

    byte[] inByte = new byte[8192];
    inByte = outMemoryStream.ToArray();
    return inByte;
}

#endregion

#region Encrypt


public static byte[] Encrypt(string inFile)
{
    FileStream inFileStream = new FileStream(inFile, FileMode.Open, FileAccess.Read);
    MemoryStream outMemoryStream = new MemoryStream();
    TripleDESCryptoServiceProvider tdes = new TripleDESCryptoServiceProvider();
    Dictionary<string,> memDict = new Dictionary<string,>();
    CryptoStream cs = new CryptoStream(outMemoryStream, tdes.CreateEncryptor(Encoding.UTF8.GetBytes(sharedkey), sharedvector), CryptoStreamMode.Write);
    int bufferLen = 4096;
    byte[] buffer = new byte[bufferLen];
    int bytesRead;
    do
    {
        // read a chunk of data from the input file
        bytesRead = inFileStream.Read(buffer, 0, bufferLen);
        // encrypt it
        cs.Write(buffer, 0, bytesRead);
    } while (bytesRead != 0);

    // close everything
    // this will also close the unrelying fsOut stream

    cs.FlushFinalBlock();
    cs.Close();
    inFileStream.Close();

    byte[] inByte = new byte[8192];
    inByte = outMemoryStream.ToArray();
    return inByte;
}

#endregion