Little program to sort Excel-datas

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Bids
28
Avg Bid (CAD)
$139
Project Budget (CAD)
$30 - $250

Project Description:
This project has to be done using WPF!

The software should do following tasks:

1) Choose and read an Excel file.
2) Sort the data according special algorithms.
3) Save the results in a new Excel file.

The Excel file has following structure:
Date / Group / Numbers(Count)
31.3.2013 / 1512 / 3
8.4.2013 / 1512 / 2
8.4.2013 / 1513 / 7
9.4.2013 / 1512 / 8
9.4.2013 / 1523 / 6
.....

First it should sort for each month, then it should add all the Numbers per each group (of a month).

As a result I want to have a new Excel file with the results (from the data above):

[ ] / March / April / ...
1510 / 3 / 17
1512 / 0 / 10
1513 / 0 / 7
1520 / 0 / 6
1523 / 0 / 6

1510 is the sum of all the 151X numbers and 1520 of all 152X and so on.

As a next step I need the datas splitted. Let's say datas of 1500-1799 in worksheet2, 1200-1399 and 1800-1999 in worksheet3 and so on. I will give you more details for this later.

I want you to do this with C#/WPF, no Window Forms please.

Skills required:
C# Programming
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