file decrypt code in C#

gistfile1.txt

public static bool Decrypte(string fileIn, string fileOut)
        {
            string Password = "mypassword";
            bool msg = true;
            FileStream fsIn = new FileStream(fileIn, FileMode.Open, FileAccess.Read);
            FileStream fsOut = new FileStream(fileOut, FileMode.OpenOrCreate, FileAccess.Write);
            PasswordDeriveBytes pdb = new PasswordDeriveBytes(Password, new byte[] { 0x49, 0x76, 0x61, 0x6e, 0x20, 0x4d, 0x65, 0x64, 0x76, 0x65, 0x64, 0x65, 0x76 });
            Rijndael alg = Rijndael.Create();
            alg.Key = pdb.GetBytes(32);
            alg.IV = pdb.GetBytes(16);
            CryptoStream cs = new CryptoStream(fsOut, alg.CreateDecryptor(), CryptoStreamMode.Write);
            try
            {
                int bufferLen = 2048;
                byte[] buffer = new byte[bufferLen];
                int bytesRead;
                long FileLenght = fsIn.Length;
                bool isPercent = FileLenght > int.MaxValue ? true : false;
                int inc = 0;
                long totalBytes = 0;
                byte[] dummybuffer = { 34 };
                int ittaration = 0;
                int dummayinc = 1;
                do
                {
                    if (ittaration == 0)
                    {
                        bytesRead = fsIn.Read(buffer, 0, dummayinc);
                        ittaration = 1;

                    }
                    else
                    {
                        dummayinc = dummayinc + 1;
                        if (dummayinc > 10)
                            dummayinc = 1;

                        bytesRead = fsIn.Read(buffer, 0, bufferLen);
                        ittaration = 0;
                    }

                    totalBytes = totalBytes + bytesRead;

                    if (isPercent)
                    {
                        double d = Convert.ToDouble(totalBytes * 100.0 / FileLenght);
                        if (d > 100)
                            d = 100;
                        inc = (int)d;
                    }
                    else
                        inc = (int)totalBytes;

                    // Decrypt it 
                    if (ittaration == 0)
                    {
                        fsOut.Write(buffer, 0, bytesRead);
                    }
                    fsOut.Flush();


                } while (bytesRead != 0);
                if (fsIn != null)
                    fsIn.Dispose();
                if (fsOut != null)
                    fsOut.Dispose();
                msg = true;
            }
            catch
            {
                if (fsIn != null)
                    fsIn.Dispose();
                msg = false;
            }
            return msg;
        }