string character checking

[azusakt]

Hi, I'm doing a printing range option, allow user type the print range like in the Microsoft Word. for example, the range can be (1,2,4-8,10-12) now, I would like to do a validation, prevent any non-useful character inside this string (i.e. except digit, "," and "-") any faster way to do this? Thanks for your help.

[PIEBALDconsult]

Yes, write a KeyPress event handler for the TextBox.

    private void tbPages\_KeyPress ( object sender , System.Windows.Forms.KeyPressEventArgs e )
    {
        if ( "0123456789,-\\b".IndexOf ( e.KeyChar ) == -1 )
        {
            e.Handled = true ;
        }
        
        return ;
    }

(\b is backspace)

[azusakt]

Thanks so much PIEBALDconsult ~