I need to add Column1 + Column2 And Display Result In Column3
But I need to do it for all rows in column3 automatically. I need a very short code.


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sum = Convert.ToInt32(dataGridView1.Rows(i).Cells(0).Value)
+ Convert.ToInt32(dataGridView1.Rows(i).Cells(2).Value)

This adds two integers in column 1 and 3 of row i together.
Store sum in the Value of a column you want.

What Is declare as "i" ?

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