private void dataGridView1_CellValueChanged(object sender, DataGridViewCellEventArgs e)
{
// Ensure the event is triggered by changes in Column1 or Column2
if (e.ColumnIndex == dataGridView1.Columns[“Price”].Index || e.ColumnIndex == dataGridView1.Columns[“Qty”].Index)
{
// Get the current row
DataGridViewRow row = dataGridView1.Rows[e.RowIndex];

            // Get the values from Column1 and Column2
            double value1 = Convert.ToDouble(row.Cells["Qty"].Value);
            double value2 = Convert.ToDouble(row.Cells["Price"].Value);

            // Calculate the result
            double result = value1 * value2;

            // Set the result in the ResultColumn
            row.Cells["Total"].Value = result;

           
        }