each item of list to database

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C#

i have a list

List<SalesDetail>  SalesList = new List<SalesDetail>();
SalesDetail detail = new SalesDetail();  

where "SalesDetail" is a class. i have a button (add) and my code on click event of add button is SalesList.Add(details); where details is object of class SalesDetail which contains public variables with {set; and get;}

but when i try to retrieve each item of the list then i only get the last item. my code retrieving each item is

foreach(SalesDetail sd in SalesList)
{

    messageBox.show(sd);

}

in my class SalesDetail i have following code

Public string Brand{get; set;}
Public string Product{get; set;}

i want to retrieve each item from list and save it to database i would like to know where i have made mistake while retrieving the data..
please help
Regards bunzitop