C# App: Numeric and Mathimatical Operators only TextBox

[LoanB]

Hi

I'm looking to ensure that my textbox only accepts numbers .. AND ... mathematical operators + - . / *. an dmaybe a blank space

I can ensure that only number are included by using:
[code=cpp]
private void txtSurname_KeyP ress(object sender, KeyPressEventAr gs e)
{
if (e.Handled = !(Char.IsDigit( e.KeyChar)))
{
e.Handled = true;
}
}[/code]

OR
[code=cpp]
private void txtTel_KeyPress (object sender, KeyPressEventAr gs e)
{
if (((e.KeyChar < '0') || (e.KeyChar > '9')) && (e.KeyChar != '\b'))
{
e.Handled = true;
}
}
[/code]
My Questions then:

1. Which one of the above is better to use to ensure that only numbers are
used?

2. How can I change the better option above to also allow me to input the
specified operators.

Thanks in advance,

Lóan

[LoanB]

Ok I managed to get it working doing the following,
[code=cpp]
private void txtTel_KeyPress (object sender, KeyPressEventAr gs e)
{
if ((e.Handled = !(Char.IsDigit( e.KeyChar))) && (e.Handled =
!(Char.IsWhiteS pace(e.KeyChar) )) && (e.Handled =
!(Char.IsPunctu ation(e.KeyChar ))) && (e.Handled =
!(Char.IsSymbol (e.KeyChar))) && (e.Handled = !(Char.IsContro l(e.KeyChar))))
{
e.Handled = true;
}
}
[/code]
this works perfectly, but does anyone know how to do th eabove in a shorter version.

Cheers,

[Frinavale]

Ok I managed to get it working doing the following,
[code=cpp]
private void txtTel_KeyPress (object sender, KeyPressEventAr gs e)
{
if ((e.Handled = !(Char.IsDigit( e.KeyChar))) && (e.Handled =
!(Char.IsWhiteS pace(e.KeyChar) )) && (e.Handled =
!(Char.IsPunctu ation(e.KeyChar ))) && (e.Handled =
!(Char.IsSymbol (e.KeyChar))) && (e.Handled = !(Char.IsContro l(e.KeyChar))))
{
e.Handled = true;
}
}
[/code]
this works perfectly, but does anyone know how to do th eabove in a shorter version.

Cheers,

The above will work for a desktop application.
If you're developing a web application please see the article on how to check if a textbox contains a number.

-Frinny

[LoanB]

Thanks mate

That will be very helpful next week when I start with the WEB stuff.