how to sort string as number in datagridview in winforms

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You can register on the SortCompare event, for example:

private void customSortCompare(object sender, DataGridViewSortCompareEventArgs e)
{
    int a = int.Parse(e.CellValue1.ToString()), b = int.Parse(e.CellValue2.ToString());

    // If the cell value is already an integer, just cast it instead of parsing

    e.SortResult = a.CompareTo(b);

    e.Handled = true;
}

...
yourGridview.SortCompare += customSortCompare;
...

I didn’t check if that works, but you get the idea… 😉

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