Triger one cell in Data grid trigers other same or other Data Grid

Use e.ColumnIndex > 1 ,  because in my sample code , the first cell and the second cell are which I want to change their value.  you can change it to fit your own situation.

private void dgridEstimationII_CellValueChanged(object sender, DataGridViewCellEventArgs e)
        {

            if (e.RowIndex ==-1 || e.ColumnIndex > 1) return;

            dgridEstimationII.CellValueChanged -= new DataGridViewCellEventHandler(dgridEstimationII_CellValueChanged);

            var a = 0;
            var b = 0;
            var c = 0;

            int.TryParse(dgridEstimationII.Rows[e.RowIndex].Cells[2].Value + "", out a);
            int.TryParse(dgridEstimationII.Rows[e.RowIndex].Cells[3].Value + "", out b);
            int.TryParse(dgridEstimationII.Rows[e.RowIndex].Cells[4].Value + "", out c);

            dgridEstimationII.Rows[e.RowIndex].Cells[5].Value = a * b;
            dgridEstimationII.Rows[e.RowIndex].Cells[6].Value = a * c;

            var d = 0;
            var f = 0;
            int.TryParse(dgridEstimationII.Rows[e.RowIndex].Cells[5].Value + "", out d);
            int.TryParse(dgridEstimationII.Rows[e.RowIndex].Cells[6].Value + "", out f);
            dgridEstimationII.Rows[e.RowIndex].Cells[7].Value = d + f;

            dgridEstimationII.CellValueChanged += new DataGridViewCellEventHandler(dgridEstimationII_CellValueChanged);
           
        }


i tried this out but problem is only when i change the cell (0 0) there are changes updating
where i dont need to change (0 0)
i think there is some thing with

if (e.RowIndex ==-1 || e.ColumnIndex > 1) return;

can you please help me with this

i have attached a attachment where i need dynamical change R/M rate (column) or And Fab rate(column) (upto user he might change only 1 or all )

then the r/w.cost =weight cell * R/M rate
  fab.cost=weight cell * Fab rate

total cost = r/wcost+fab.cost

can you please send me the code for this the above code by you was fine but i tried to change but could not make it right

Thank you in advance

I think you can achieve CellValueChanged event.  like bellow.

        private void dataGridView1_CellValueChanged(object sender, DataGridViewCellEventArgs e)
        {
            if (e.RowIndex == -1 || e.ColumnIndex > 1) return;

             dataGridView1.CellValueChanged -=new DataGridViewCellEventHandler(dataGridView1_CellValueChanged);

            var a = 0;
            var b = 0;

            int.TryParse(dataGridView1.Rows[e.RowIndex].Cells[0].Value + "", out a);
            int.TryParse(dataGridView1.Rows[e.RowIndex].Cells[1].Value + "", out b);

            dataGridView1.Rows[e.RowIndex].Cells[2].Value = a + b;
            dataGridView1.Rows[e.RowIndex].Cells[3].Value = a - b;
            dataGridView1.Rows[e.RowIndex].Cells[4].Value = a * b;
            dataGridView1.Rows[e.RowIndex].Cells[5].Value = b == 0 ? 0 : a / b;

            dataGridView1.CellValueChanged += new DataGridViewCellEventHandler(dataGridView1_CellValueChanged);
        }