Unhandled exception at 0x77F3CCD2 (msvcp110d.dll) in Supermarket_Billing_System.exe: 0xC0000005: Access violation writing location 0xDDDDDDDD.

Hello,
I am trying to solve an assignment containing file handling.
I am getting error "Memory access violation error".
I know the erroneous statement is "file.read((char*)&p,sizeof(Product))" in Supermarket_Billing_System.cpp line no 103.
Please help me to solve.
following are the 2 functions, first one is functioning correctly. While 2nd function is executing whole 
get executed correctly and while returning to main body it crashes. If i comment "file.read()" part then 
application did not crash.
So what should i do?


void Supermarket_Billing_System::Add_and_WriteNewProduct(Product P)
{
	//Need To Implement
	ofstream file;
	file.open("inventory.bin",ios::out|ios::binary|ios::app);
	file.write((char*)&P,sizeof(Product));
	file.close();



}

//Read display the product from product list
void Supermarket_Billing_System::Read_DisplayProductFromProductList()
{
		//Need To Implement

	ifstream file;
	Product p;
	file.open("inventory.bin",ios::in|ios::binary);
	while(file.read((char*)&p,sizeof(Product)))  //erroneous statement file.read((char*)&p,sizeof(Product))??
		p.Display_Product();
	file.close();

}