C#

DirectoryInfo da = new DirectoryInfo("C:\\Folder");
FileInfo[] Arr = da.GetFiles();
if (Arr.Length == 0)
{
    throw new InvalidOperationException("No files found.");
}


// No need to loop through the array just to get the last item:
FileInfo ap = Arr[Arr.Length - 1];
long Totbyte = ap.Length;
string filePath = ap.FullName;
Console.WriteLine("Total Bytes = {0} bytes", Totbyte);


// GetTempFileName *creates* the file, so it always exists:
string temPath = Path.GetTempFileName();
byte[] data = File.ReadAllBytes(filePath);
File.WriteAllBytes(temPath, data);


// Convert the bytes to decimals:
decimal[] arry = new decimal[Totbyte];
for (int count = 0; count < data.Length; count++)
{
    arry[count] = data[count];
}


// Convert the decimals back to bytes:
byte[] data2 = new byte[Totbyte];
for (int count = 0; count < arry.Length; count++)
{
    data2[count] = (byte)arry[count];
}


// Just to prove they're the same:
if (data2.Length != data.Length)
{
    throw new InvalidOperationException("Wrong length!");
}
for (int index = 0; index < data.Length; index++)
{
    if (data[index] != data2[index])
    {
        throw new InvalidOperationException("Data has changed at index " + index);
    }
}


// Write the bytes back to the file:
File.WriteAllBytes(filePath, data2);


// To prove they're still the same:
data = File.ReadAllBytes(temPath);
data2 = File.ReadAllBytes(filePath);

if (data2.Length != data.Length)
{
    throw new InvalidOperationException("Wrong length!");
}
for (int index = 0; index < data.Length; index++)
{
    if (data[index] != data2[index])
    {
        throw new InvalidOperationException("Data has changed at index " + index);
    }
}

// Write the bytes to a different file:
string filePath2 = Path.Combine("C:\\A Different Folder", Path.GetFileName(filePath));
File.WriteAllBytes(filePath2, data2);

<pre>/*
IT DOESN'T WORK..I ADDED THE LINE:::string filePath2 = Path.Combine("C:\\check", Path.GetFileName(filePath));
I RAN THE PROGRAM AND CHECK FOLDER WAS EMPTY. THE FILE WAS NOT WRITTEN TO THE NEW LOCATION. ALL I WANT TO DO SEE ANOTHER INSTANCE OF THE FILE
*/

using System;
using System.IO;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace Applica
{
    class Program
    {
        static void Main(string[] args)
        {
            DirectoryInfo da = new DirectoryInfo("C:\\Folder");
            FileInfo[] Arr = da.GetFiles();
            if (Arr.Length == 0)
            {
                throw new InvalidOperationException("No files found.");
            }
            // No need to loop through the array just to get the last item:
            FileInfo ap = Arr[Arr.Length - 1];
            long Totbyte = ap.Length;
            string filePath = ap.FullName;
            Console.WriteLine("Total Bytes = {0} bytes", Totbyte);
            // GetTempFileName *creates* the file, so it always exists:
            string temPath = Path.GetTempFileName();
            byte[] data = File.ReadAllBytes(filePath);
            File.WriteAllBytes(temPath, data);
            // Convert the bytes to decimals:
            decimal[] arry = new decimal[Totbyte];
            for (int count = 0; count < data.Length; count++)
            {
                arry[count] = data[count];
            }
            // Convert the decimals back to bytes:
            byte[] data2 = new byte[Totbyte];
            for (int count = 0; count < arry.Length; count++)
            {
                data2[count] = (byte)arry[count];
            }
            // Just to prove they're the same:
            if (data2.Length != data.Length)
            {
                throw new InvalidOperationException("Wrong length!");
            }
            for (int index = 0; index < data.Length; index++)
            {
                if (data[index] != data2[index])
                {
                    throw new InvalidOperationException("Data has changed at index " + index);
                }
            }
            // Write the bytes back to the file:
            string filePath2 = Path.Combine("C:\\check", Path.GetFileName(filePath));
            File.WriteAllBytes(filePath, data2);
            // To prove they're still the same:
            data = File.ReadAllBytes(temPath);
            data2 = File.ReadAllBytes(filePath);
            if (data2.Length != data.Length)
            {
                throw new InvalidOperationException("Wrong length!");
            }
            for (int index = 0; index < data.Length; index++)
            {
                if (data[index] != data2[index])
                {
                    throw new InvalidOperationException("Data has changed at index " + index);
                }
            }

        }
    }
}

computerpublic wrote:

string filePath2 = Path.Combine("C:\\check", Path.GetFileName(filePath));
File.WriteAllBytes(filePath, data2);

// Write the bytes to a different file:
string filePath2 = Path.Combine("C:\\check", Path.GetFileName(filePath));
File.WriteAllBytes(filePath2, data2); // <-- NB: Pass filePath2 here, not filePath!

<pre>/*
I AM NOW TRYING TO CONVERT BYTE TO STRING AND ALSO CONVERTING BACK FROM STRING TO BYTE. 
I ALSO WANT TO SEE THE OUTPUT.
I AM NOT UNDERSTING WHY I AM GETTING AN ERROR.
THE OUTPUT INFORMATION IS BELOW::

Total Bytes = 8228730 bytes

Unhandled Exception: System.InvalidOperationException: Data has changed at index
 310
   at Applica.Program.Main(String[] args) in C:\Documents and Settings\shampro\D
esktop\Program.cs:line 41
Press any key to continue . . .
*/

using System;
using System.IO;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace Applica
{
    class Program
    {
        static void Main(string[] args)
        {
            DirectoryInfo da = new DirectoryInfo("C:\\Folder");
            FileInfo[] Arr = da.GetFiles();
            if (Arr.Length == 0)
            {
                throw new InvalidOperationException("No files found.");
            }
            // No need to loop through the array just to get the last item:
            FileInfo ap = Arr[Arr.Length - 1];
            long Totbyte = ap.Length;
            string filePath = ap.FullName;
            Console.WriteLine("Total Bytes = {0} bytes", Totbyte);
            // GetTempFileName *creates* the file, so it always exists:
            string temPath = Path.GetTempFileName();
            byte[] data = File.ReadAllBytes(filePath);
            File.WriteAllBytes(temPath, data);
            // Convert the bytes to string:
            string arry = ASCIIEncoding.ASCII.GetString(data);
            Console.WriteLine(arry);
            // Convert the string back to bytes:
            byte[] data2 = Encoding.ASCII.GetBytes(arry);
            foreach (byte element in data2)
            {
                Console.WriteLine("{0}={1}",element ,(char)element);
            }
            // Just to prove they're the same:
            if (data2.Length != data.Length)
            {
                throw new InvalidOperationException("Wrong length!");
            }
            for (int index = 0; index < data.Length; index++)
            {
                if (data[index] != data2[index])
                {
                    throw new InvalidOperationException("Data has changed at index " + index);
                }
            }
            // Write the bytes back to the file:
            string filePath2 = Path.Combine("C:\\check", Path.GetFileName(filePath));
            File.WriteAllBytes(filePath2, data2);
            // To prove they're still the same:
            data = File.ReadAllBytes(temPath);
            data2 = File.ReadAllBytes(filePath);
            if (data2.Length != data.Length)
            {
                throw new InvalidOperationException("Wrong length!");
            }
            for (int index = 0; index < data.Length; index++)
            {
                if (data[index] != data2[index])
                {
                    throw new InvalidOperationException("Data has changed at index " + index);
                }
            }

        }
    }
}

computerpublic wrote:

I continually being ask "What are you trying to achieve"? As if a non programmer is not allowed to ask questions and learn from people who know.

<pre>/*If I am generating a series of bits ONE BIT AT A TIME for example {10101000}. How do I turn the entire series into one byte after I generate the 8th bit. I am trying to back track using the example you gave me, but I am getting some errors.*/

using System;
using System.IO;
using System.Collections;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace Applica
{
    class Program
    {
        static Random _random = new Random ();////Start: Fisher-Yates Array Shuffler
        public static void Shuffle<T>(T[] array)
        {
            var random = _random;
            for (int i = array.Length; i > 1; i--)
            {
                int j = random.Next(i);
                T tmp = array[j];
                array[j] = array[i - 1];
                array[i - 1] = tmp;
            }
        }////////////////////////////////////////////End: Fisher-Yates Array Shuffer
        static void Main(string[] args)
        {
            byte[] outdata = new byte[1];
            BitArray[] bits2 = new BitArray[8];
            char[] array = {'1','0','1','0','1','0','1','0'};
            Shuffle(array);
            for (int i = 0; i < 8; i++)
                bits2[i] = array[1];//Error: Cannot Implicitly convert type 'char' to 'System.Collections.BitArray'
            outdata[i] = (byte)bits2;//Error: Cannot convert type 'System.Collections.BitArray[]' to 'byte' 
        }
    }
}

static public String Dpath = Application.StartupPath + "\\Data\\";
        static public String DB_NAME = Dpath + Application.ProductName + ".sdf";
        static public String DB_PWD = "";
        static public string sql;
        static private string _filename;
        static public string filename
        {
            get { return _filename; }
            set { _filename = value; }
        }
        static private string _filecontent;
        static public string filecontent
        {
            get { return _filecontent; }
            set { _filecontent = value; }
        } 
  static public string ConnectString()
		{
			string connectionString = string.Format("DataSource=\"{0}\"; Password=\"{1}\"", DB_NAME, DB_PWD);
			return connectionString;
		}

		static public void CreateDB()
		{
			SqlCeEngine en = new SqlCeEngine(ConnectString());
			en.CreateDatabase();
			en.Dispose();
			en = null;
		}

		static public void CreateTable(string TName)
		{
			SqlCeConnection cn = new SqlCeConnection(ConnectString());
			if (cn.State == ConnectionState.Closed)
			{
				cn.Open();
			}
			SqlCeCommand cmd;
			sql = "create table " + TName + "("
				+ "ID INT IDENTITY (1,1) PRIMARY KEY not null, "
				+ "FileName NVarChar(50), "
				+ "FileContent NTEXT)";
			cmd = new SqlCeCommand(sql, cn);
			cmd.ExecuteNonQuery();
			cn.Close();
		}