FileStream *source_file = new FileStream(textBox1->Text, FileMode::Open, FileAccess::Read);
FileStream *output_file= new FileStream(textBox2->Text,  FileMode::Open, FileAccess::Write);
BinaryReader *w = new BinaryReader(source_file);                    
BinaryWriter *s = new BinaryWriter(output_file);

ch=w->ReadByte(); // Побайтное чтение из source_file
byte