Question

I have a DataGridView bound to a DataTable in a DataSet.

I set all columns of the DataTable to System.Double.

I want the last row of the DataGridView to display "PASS" or "FAIL" depending on some condition of the values in that column.

How do I do this?

Ideas:
lastCell = IIF(condition, Double.PositiveInfinity, Double.NegativeInfinity)
Then, apply some conditional formatting (Inf -> PASS, -Inf -> FAIL) to the final row of the DataGridView.

Answer 1

You could probably create and use a custom NumberFormatInfo, setting PositiveInfinitySymbol and NegativeInfinitySymbol to the strings you want.

But I’d say it would be better to do something like this in the DataGridView.CellFormatting event handler – which makes it much clearer what you’re doing and why, and won’t have undesirable side effects e.g. if another cell happens to have an infinite value because of a division by zero.

Something like the following air code:

void dataGridView1_CellFormatting(object sender, 
    DataGridViewCellFormattingEventArgs e)
{
    if ((e.ColumnIndex == whatever) && (c.RowIndex == whatever))
    {
        // ... comment explaining what you're doing
        if (condition)
        {
            e.Value = "PASS";
        }
        else
        {
           e.Value = "FAIL";
        }
        e.FormattingApplied = true;
    }
}

Apologies for the C# code given you’ve tagged the question VB.NET, but you’ll find a VB.NET sample in the MDSN documentation for the CellFormatting event.