Only allow two digits after decimal in textbox?

Question

I have a textbox where the user enters a number, but how can i make it so that if they type the \'.\' after it it only allows 2 decimal places?

private void          


        

Answer 1

Personaly I am using this, Its not very elegant but works like a charm. This script restrict user to use only numeric characters, only 1 dot ,just 2 decimal numbers and backspace.

so acceptable inputs will be something like : 1.22 , 2135.25, 3535.5 etc.

void Decimal(object sender, KeyPressEventArgs Event) {
            Event.Handled = true;
            bool FalseInput = !char.IsControl(Event.KeyChar) && !char.IsDigit(Event.KeyChar) && !char.IsControl(Event.KeyChar) && Event.KeyChar != 8 && Event.KeyChar != '.';
            if (!FalseInput){
                Event.Handled = false;
                if (Regex.IsMatch(FreightTextBox.Text, @"^\d+\.\d*$") && Event.KeyChar != 8) {
                    bool ContainDot = FreightTextBox.Text.Contains(".");
                    Event.Handled = true;
                    if (ContainDot && Event.KeyChar != 8 && Event.KeyChar!='.'){
                        Event.Handled = Regex.IsMatch(FreightTextBox.Text, @"\.\d\d");
                    }
                }
            }
        }