C#

if ((bool)row.Cells[this.invoiceNO.Index].Value)

Rebyc Rebyc wrote:

because it is being used by another process"

private Dictionary<char, int> numbers;
        private void textBox1_KeyPress(object sender, KeyPressEventArgs e)
        {
            string number = tbHint1.Text + tbHint2.Text + tbHint3.Text + tbHint4.Text + tbHint5.Text + tbHint6.Text;
            numbers = number.GroupBy(c => c).ToDictionary(g => g.Key, g => g.Count());
            if (char.IsDigit(e.KeyChar) || char.IsSymbol(e.KeyChar))
            {
                char keyPressedByUser = e.KeyChar;
                if (!number.Contains(keyPressedByUser))
                {
                    e.Handled = true;
                    return;
                }
                int inputCount = textBox1.Text.ToUpper().Where(c => c == keyPressedByUser).Count() + 1;
                if (inputCount > numbers[keyPressedByUser])
                {
                    e.Handled = true;
                    return;
                }
                e.Handled = false;
            }
            else
            {
                e.Handled = true;
            }
        }

Public Const IntegerStrings As String = "0123456789" + ChrW(8) ' Numbers & backspace

Public Sub IntegerKeyPress(ByVal sender As System.Object, ByVal e As System.Windows.Forms.KeyPressEventArgs) Handles tbHigh.KeyPress, tbLow.KeyPress
        '
        ' Ignore non-numeric keys
        '
        If IntegerStrings.IndexOf(e.KeyChar) = -1 Then
            e.Handled = True
        End If
    End Sub

void oznaci_po_redu(int s)
{
l = 0;
while (s > 0)
{
l++;
if (!uzet[l]) s--; -----Index was outside the bounds of the array--------
}
uzet[l] = true;
}