public int Compare(object item1, object item2)
{
if (item1 is null)
{
if (item2 is null)
{
return(0); //both null, then they are equal
}
return(-1); //item1 is null, but item2 is valid (greater)
}
if (item2 is null)
{
return(1); //item2 is null, so item 1 is greater
}
string itemName1 = dataGridViewComboBoxCell.GetItemDisplayText(item1);
string itemName2 = dataGridViewComboBoxCell.GetItemDisplayText(item2);
CompareInfo compInfo = Application.CurrentCulture.CompareInfo;
return(compInfo.Compare(itemName1, itemName2, CompareOptions.StringSort));
}
