DataGridView sorting with nulls in DateTime column

Question

I\'ve got a DataGridView control in a Windows forms application. There are four columns with string data and three with DateTime data. I\'m adding the rows programmatically

Answer 1

Just to add some code to this question... I did the following to get sorting to work correctly for DateTime (and other non-string types) in the presence of nulls:

public MyFormCTor() {
    ...
    m_dataGridView.SortCompare += MySortCompare;
    ...
}

...

static void MySortCompare(object sender, DataGridViewSortCompareEventArgs e)
{
    if (e.CellValue1 == e.CellValue2)
    {
        e.SortResult = 0;
        return;
    }

    if (e.CellValue1 == null)
    {
        e.SortResult = -1;
        return;
    }

    if (e.CellValue2 == null)
    {
        e.SortResult = 1;
        return;
    }

    e.SortResult = ((IComparable)e.CellValue1).CompareTo(e.CellValue2);
}