private void RequestsGrid_CellClick(object sender, DataGridViewCellEventArgs e) { if (requestsGrid.SelectedRows.Count > 0) { DataGridViewRow row = requestsGrid.SelectedRows[0]; proxy.SendBooks( (string)row.Cells["bookColumn"].Value, (int)row.Cells["quantityColumn"].Value, (Guid)row.Cells["orderIdColumn"].Value ); } }