private void Rewards_ColumnClick(object sender, DataGridViewCellMouseEventArgs e)
{
if (sortModeRewards == SortMode.Asceding)
{
rewards.SortRewards("descending");
sortModeRewards = SortMode.Desceding;
}
else
{
rewards.SortRewards("ascending");
sortModeRewards = SortMode.Asceding;
}
DisplayReward();
}