C#

void textBoxSample_KeyPress(object sender, KeyPressEventArgs e)
    {
        e.Handled = Char.IsPunctuation(e.KeyChar) ||  
                      Char.IsSeparator(e.KeyChar) || 
                      Char.IsSymbol(e.KeyChar);
    }

private void nicstrength_KeyPress(object sender, KeyPressEventArgs e)
{
    e.Handled = Char.IsSeparator(e.KeyChar) || Char.IsSymbol(e.KeyChar); //|| Char.IsPunctuation(e.KeyChar);

}

private void nicstrength_TextChanged(object sender, EventArgs e)
{
    double ns;
    if (string.IsNullOrEmpty(nicstrength.Text))
        // do nothing
        ;
    else
    {
        if ((nicstrength.Text.Any(chr => char.IsLetter(chr))) || (nicstrength.Text.StartsWith(".")))


        {
            MessageBox.Show("Please enter a number between 1 and 10 inc decimal points i.e 7.2");
            nicstrength.Clear();
            nicstrength.Focus();
        }
        else
        {
            ns = Convert.ToDouble(nicstrength.Text);

            if (!(ns >= 1 && ns <= 10))
            {
                MessageBox.Show("Please enter a number between 1 and 10 inc decimal points i.e 7.2");
                nicstrength.Clear();
                nicstrength.Focus();
            }
        }

    }
}

private readonly char[] notallowed = { '!', '"', '#', '%', '&', '\'', '(', ')', '*', ',', '-', '/', ':', ';', '?', '@', '[', '\\', ']', '_', '{', '}', '+' };

if ((nicstrength.Text.Any(chr => char.IsLetter(chr))) || (nicstrength.Text.StartsWith(".")) || (nicstrength.Text.IndexOfAny(notallowed) != -1))

Member 13511312 wrote:

I'm actually developing my application in the WPF c# environment.

Rick_Bishop wrote:

I'm sure Gerry appreciates your coming to his rescue