C# Digit-only TextBoxes in a GroupBox.

Question

I'm using WinForms and I'm struggling trying to make all the TextBoxes from a GroupBox to accept only digits as user input. Is there a way to raise the KeyPress event for all the TextBoxes in a GroupBox? Something like this maybe:

private void groupBox1_KeyPress(object sender, KeyPressEventArgs e)
{
    if (!char.IsControl(e.KeyChar) && !char.IsDigit(e.KeyChar)
        {
            e.Handled = true;
        }
}

I'm quite new at this, so please bear with me. Any help would be greatly appreciated.

Answer 1

You can try this code :

    private void textBox_KeyPress(object sender, KeyPressEventArgs e)
{
    if (!char.IsControl(e.KeyChar) && !char.IsDigit(e.KeyChar) &&
        (e.KeyChar != '.'))
    {
            e.Handled = true;
    }

    // only allow one decimal point
    if ((e.KeyChar == '.') && ((sender as TextBox).Text.IndexOf('.') > -1))
    {
        e.Handled = true;
    }
}

The source answer from here How do I make a textbox that only accepts numbers?