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Datagridview column running total

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Last Modified: 2013-12-27
I need sample code for the following example:

Col1      Col2

1. 123|  123
2. 123|  246
3. 123|  369
4. 123|  492

I want to keep a running total of Col1 values in Col2.
Row 1 Col2 to show Col1 cell 1 value
Row 2 Col2 to show sum of Col1 cells 1 & 2.
Row 3 Col2 to show sum of Col2 cells 1 & 2 & 3
Row 4 Col2 to show sum of Col2 cells 1 & 2 & 3 & 4

Column 1 is databound - Column 2 can be databound or unbound...

Thanks!
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