dspic33f

hi can anybody provide me c code examples for flash erase and programming.
and tell me whether it is necessary to save the pages or that is optional. 
     will the below will do?
/* Page size array (512 instruction words) */
    C_UBYTE Luilow_Page_Array[512];         
    C_UBYTE Luihigh_Page_Array[512]; 
    C_UINT16 Luipage_Count;
         
 /* Save Current page */
   C_UINT16 SAV_TBLPAG = TBLPAG;        
                  
   C_UINT16 *LppPM_Destination_Address = (C_UINT16 *)(Lul_Sector_Addr);
    
 /* A dummy table write to any location in the page selects the address of
the row to be erased. 
  * The program memory must be erased at an even 512 instruction word
address boundary. Therefore,
  * the 10 Least Significant bits of the table write program memory address
have no effect when
  * a page is erased */   
   Luipage_flash_addr = (Lul_Sector_Addr & 0xFFFC00);

 /* Save flash page data */                 
  for(Luipage_Count=0; Luipage_Count<512; Luipage_Count++)                 
     
  {
  Luilow_Page_Array[Luipage_Count] = __builtin_tblrdl(Luipage_flash_addr+
(2 * Luipage_Count));
  Luihigh_Page_Array[Luipage_Count]= __builtin_tblrdh(Luipage_flash_addr+
(2 * Luipage_Count)) & 0xFF;
  }
  
  /* Setup NVMCON to erase one page of Program Memory */
  NVMCON=PAGE_ERASE;
  
  /* Select the Page to be erased */
  /* Upper byte address */
  TBLPAG = ((Luiflash_addr>>16)&(0xFF));
  
  /* Dummy write */
  __builtin_tblwtl(Luipage_flash_addr, 0xFFFF); 
  
  /* Write the KEY Sequence */
  NVMKEY=KEY_SEQ_1;
  NVMKEY=KEY_SEQ_2;
  
  /* Start the erase operation */
  /*  __builtin_write_NVM();*/
  NVMCON|=ERASE_INIT;
  
  Nop()
  Nop()
  
  /* Wait till the Erase operation completes */
  while(NVMCON_WR);
  
  /* Restore Table page */
  TBLPAG = SAV_TBLPAG;                    


	   
					
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