Не сохраняется изображение в файл

void __fastcall TForm1::Button1Click(TObject *Sender)
{
Graphics::TBitmap *bitmap=new Graphics::TBitmap; 
bitmap->LoadFromFile("1.bmp"); 
bitmap->Canvas->Rectangle(25,25,125,125);  
Canvas->Draw(0,0,bitmap); 
}
//---------------------------------------------------------------------------
 
void __fastcall TForm1::Button2Click(TObject *Sender)
{ Graphics::TBitmap *bitmap=new Graphics::TBitmap;
bitmap->SaveToFile("2.bmp"); 
delete bitmap;

Graphics::TBitmap *bitmap=new Graphics::TBitmap;

#include <vcl.h>
#pragma hdrstop
 
#include "Unit13.h"
//---------------------------------------------------------------------------
#pragma package(smart_init)
#pragma resource "*.dfm"
TForm13 *Form13;
Graphics::TBitmap *bitmap=new Graphics::TBitmap;
//---------------------------------------------------------------------------
__fastcall TForm13::TForm13(TComponent* Owner)
    : TForm(Owner)
{
}
//---------------------------------------------------------------------------
void __fastcall TForm13::Button1Click(TObject *Sender)
{
 
bitmap->LoadFromFile("1.bmp");
bitmap->Canvas->Rectangle(25,25,125,125);
Canvas->Draw(0,0,bitmap);
}
//---------------------------------------------------------------------------
void __fastcall TForm13::Button2Click(TObject *Sender)
{
 
bitmap->SaveToFile("2.bmp");
delete bitmap;
}
//---------------------------------------------------------------------------