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
);
}
}