DataGridView Manipulation

Question

Hello all..

I have design a C#.NET Winforms app for Order Processing system.
in which I have used a DataGridView to select Items from Item_mst.
The gridview contains following columns.
1. Item (combobox column)
2. Qty
3. Uints.
4. Price per unit.
5. Total.

Now when I select an item from the list and give qty, units priceperunit, then total amount should be calculated in total column , which is like templated column.

I think, I have to capture datagridview comboboxcolumn event for that.

How do I Achieve this? Please give example code.

Thanks.