private void dataGridViewSelectedSuppliers_CellContentClick(object sender, DataGridViewCellEventArgs e)
        {
            //if click is on new row or header row
            if (e.RowIndex == dataGridViewSelectedSuppliers.NewRowIndex || e.RowIndex < 0)
            {
                return;
            }

            //Check if click is on specific column
            if (e.ColumnIndex == dataGridViewSelectedSuppliers.Columns["dataGridViewButtonColumnDeleteSelectedSupplier"].Index)
            {
                dataGridViewSelectedSuppliers.Rows.RemoveAt(e.RowIndex);
                selectedSuppliers.RemoveAt(e.RowIndex);
            }
        }