I'm working in c#. I have a sorted List of structures. The structure has a DateTime object which stores month and year and an integer which stores a value. The list is sorted by date. I need to traverse the list and combine it so that I only have one instance of the structure per date.

For example: My initial list would look like this:

{ (Apr10, 3), (Apr10, 2), (Apr10, -3), (May10, 1), (May10, 1), (May10, -3), (Jun10, 3) } 

The resulting list should look like this:

{ (Apr10, 2), (May10, -1), (Jun10, 3) }

I'm looking for a simple / efficient solution.

The struct is:

class CurrentTrade
{
    public DateTime date;
    public int dwBuy;
}

The list is:

private List<CurrentTrade> FillList