Errore Index e length devono fare riferimento a una posizione nella stringa.

[rciorra]

Hi, i have this message
Index e length devono fare riferimento a una posizione nella stringa.
Nome parametro: length
i don't know because the code after "else" generates the error.

imponibile = System.Math.Round((totale / (1 + (iva / 100))), 2, MidpointRounding.ToEven);
        String res2 = "" + imponibile;
        String[] arres2 = res2.Split(',');
        if (arres2.Length > 1)
        {
            res2 = arres2[0] + ",";
            String dec = arres2[1];
            if (dec.Length >= 2)
                res2 += dec.Substring(0, 2);
            else
                res2 += dec.Substring(0, 2);

        }
        TextBoxMImponibile.Text = res2;

[computerfox]

Looks like the error is in Spanish.

I would suggest starting with adding the brackets for the conditional statements, I believe there are newlines before the statement plus its standard practice to do so.

For debugging, print dec prior to the if statement.