C# 在数据网格视图中添加

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我正在尝试获取数据，一旦用户键进入数据网格视图，它将自动将数据1和数据2添加到一起，并显示总数，但在这里它不起作用。这是我的代码。到目前为止，我已通过添加按钮使它们相加

      private void dataGridView1_CellStyleContentChanged(object sender, DataGridViewCellStyleContentChangedEventArgs e)
    {
        try
        {
            var a = Convert.ToDouble(dataGridView1.Rows[1].Cells[0].Value) + Convert.ToDouble(dataGridView1.Rows[2].Cells[0].Value);
            dataGridView1.Rows[3].Cells[0].Value = a;

            var b = Convert.ToDouble(dataGridView1.Rows[1].Cells[1].Value) + Convert.ToDouble(dataGridView1.Rows[2].Cells[1].Value);
            dataGridView1.Rows[3].Cells[1].Value = b;

            var c = Convert.ToDouble(dataGridView1.Rows[1].Cells[2].Value) + Convert.ToDouble(dataGridView1.Rows[2].Cells[2].Value);
            dataGridView1.Rows[3].Cells[2].Value = c;

            var d = Convert.ToDouble(dataGridView1.Rows[1].Cells[3].Value) + Convert.ToDouble(dataGridView1.Rows[2].Cells[3].Value);
            dataGridView1.Rows[3].Cells[3].Value = d;

            var f = Convert.ToDouble(dataGridView1.Rows[1].Cells[4].Value) + Convert.ToDouble(dataGridView1.Rows[2].Cells[4].Value);
            dataGridView1.Rows[3].Cells[4].Value = f;

            var g = Convert.ToDouble(dataGridView1.Rows[1].Cells[5].Value) + Convert.ToDouble(dataGridView1.Rows[2].Cells[5].Value);
            dataGridView1.Rows[3].Cells[5].Value = g;

            var h = Convert.ToDouble(dataGridView1.Rows[1].Cells[6].Value) + Convert.ToDouble(dataGridView1.Rows[2].Cells[6].Value);
            dataGridView1.Rows[3].Cells[6].Value = h;

            var i = Convert.ToDouble(dataGridView1.Rows[1].Cells[7].Value) + Convert.ToDouble(dataGridView1.Rows[2].Cells[7].Value);
            dataGridView1.Rows[3].Cells[7].Value = i;

            var j = Convert.ToDouble(dataGridView1.Rows[1].Cells[8].Value) + Convert.ToDouble(dataGridView1.Rows[2].Cells[8].Value);
            dataGridView1.Rows[3].Cells[8].Value = j;

            var k = Convert.ToDouble(dataGridView1.Rows[1].Cells[9].Value) + Convert.ToDouble(dataGridView1.Rows[2].Cells[9].Value);
            dataGridView1.Rows[3].Cells[9].Value = k;

            var l = Convert.ToDouble(dataGridView1.Rows[1].Cells[10].Value) + Convert.ToDouble(dataGridView1.Rows[2].Cells[10].Value);
            dataGridView1.Rows[3].Cells[10].Value = l;

            var n = Convert.ToDouble(dataGridView1.Rows[1].Cells[11].Value) + Convert.ToDouble(dataGridView1.Rows[2].Cells[11].Value);
            dataGridView1.Rows[3].Cells[11].Value = n;
        }

        catch
        {
            MessageBox.Show("Never run");
        } 
    }

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您可以通过在dgvHmm中的所有行上循环来缩短整个代码，但我想要的是，当数据1和数据2的值为关键值时，它将自动计算总计并在总计列中显示总计值