Random file size

Ok i made a function a long time ago to add random file byte size (white space) to a file and its been doing nothing, so if it will help anyone here it is:

Code:

public bool ByteToFile(string FileName)
        {
            try
            {
                byte[] Buffer1 = null;
                byte[] ByteArray = null;
                int RandSize = 322024; //size
                Random rand = new Random();
                byte[] nullArray = new byte[rand.Next(RandSize) + 1];
                Buffer1 = File.ReadAllBytes(FileName);
                ByteArray = new byte[Buffer1.Length + nullArray.Length + 1];
                Buffer.BlockCopy(Buffer1, 0, ByteArray, 0, Buffer1.Length);
                Buffer.BlockCopy(nullArray, 0, ByteArray, Buffer1.Length, nullArray.Length);
                FileStream FileStream = new FileStream(FileName, FileMode.Create, FileAccess.Write);
                FileStream.Write(ByteArray, 0, ByteArray.Length);
                FileStream.Close();
                return true;
            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.Message);
            }
            return false;
        }

Usage:

Code:

ByteToFile(Your file);