Question

In a windows Form, I have a text box where I put amounts, for example I would type 18369.25 then press Enter key, the textbox should be formatted to: 18 369,25
how to do that ?

Answer 1

Subscribe to the textbox’s KeyPress event with an event handler similar to the one below:

private void textBox1_KeyPress(object sender, KeyPressEventArgs e)
{
    if (e.KeyChar == '\r')
    {
        decimal value;
        if (decimal.TryParse(
            textBox1.Text,
            NumberStyles.Any,
            CultureInfo.InvariantCulture,
            out value))
        {
            textBox1.Text = value.ToString(
                "### ### ##0.00",
                CultureInfo.InvariantCulture).TrimStart().Replace(".", ",");
        }
    }
}