private void Rewards_ColumnClick(object sender, DataGridViewCellMouseEventArgs e)
{
if (sortMode1 == RewardSortMode.Asceding)
{
rewards.SortRewardsByFullNameDesc();
sortMode1 = RewardSortMode.Desceding;
}
else
{
rewards.SortRewardsByFullNameAsc();
sortMode1 = RewardSortMode.Asceding;
}
DisplayReward();
}