Sir plz tell me how to calculate all rows data . i mean how i change this code into for loop .
Code:
Public Class Form1

Dim A As Double
Dim B As Double
Dim C As Double
Dim D As Double
Dim Z As Double

Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click

A = Double.Parse(DataGridView1.Item(0, 0).Value)
B = Double.Parse(DataGridView1.Item(1,
...