How to make an number only text box?

[Ming Luo]

Hi all: I am doing a windows form application. I need to some textboxes which can only be inserted numbers like prices. Is there any existing component in windows application of C# please? What's the best way of achieving this please? Thanks alot

Asura

[Lost User]

Process the KeyDown event and check, if it's a number:

try
{
int number = int.Parse(textbox.Text);
}
catch (Exception e)
{
// text is not a number
}

You could also use a MaskedEditBox (or how that is called, I haven't used this one yet) regards

[3Dizard]

Greeeg is definitely right, but I'd prefer a slightly different way than using exception. Here's the code: private void AmountBox_KeyPress(object sender, KeyPressEventArgs e) { switch (e.KeyChar) { case '0': break; case '1': break; case '2': break; case '3': break; case '4': break; case '5': break; case '6': break; case '7': break; case '8': break; case '9': break; default: e.Handled = true; break; } } Setting Handled to true prevents the input from being processed further and that is exactly what you want for anything else than numbers. BTW: This is a function for the KeyPress event. Greetings

[Martin23]

This is a better way still. Using execeptions is not a good idea. private void AmountBox_KeyPress(object sender, KeyPressEventArgs e) { if(!char.IsNumber(e.KeyChar)) e.Handled = true; }