C#

public string File_Copy(string strSource,string strDestination,FileMode mode,int bufferSize,int Action)
    {
        byte[] readFile ;
            ///1 read file Binary
        ///
        FileStream Sfs = File.OpenRead(strSource);
        FileStream Dfs = File.Open(strDestination,mode);
        FileInfo Sinfo = new FileInfo(Sfs.Name);
        FileInfo Dinfo=new FileInfo(Dfs.Name);
        //initilize FileSize On Memory
        readFile= new byte[bufferSize]; // Buffer size like 1000 bytes
        //
        #region If sfs.CanRead And Dfs.CanWrite
        if (Sfs.CanRead && Dfs.CanWrite)
        {
            //Set Progress File Name On Form1
        Form1.progCurrentFile.Text = strSource;
            while (Sfs.Length - Sfs.Position>=bufferSize)
            {
                #region reading and writing Buffer
                try
                {
                    //Read Buffer
                    Sfs.Read(readFile,int.Parse(Sfs.Position.ToString()),bufferSize);
                    //Write Buffer
                    Dfs.Write(readFile,int.Parse(Dfs.Length.ToString()),bufferSize);
                    //UpdatePersentageOfFile(Sfs.Position,Sfs.Length);
                    System.Windows.Forms.Application.DoEvents();
                }
                    #region  Damaged File Found
                catch(System.Exception ex)
                                    {
                                    messageBox(ex.Message);
                {
                             }
                      }
                }