Number Only in TextBox

After receiving a lot of emails about how to filter keys that accepts only number character, I decided to post this simple code to illustrate on how easy it is to allow only numbers and other character like comma (,), Period (.) and Backspace key.

So far this is the best code that filters character on a textbox. There are lots of codes on the internet but some don’t allow backspace and a comma.

The code is useful if you want to limit the character of a textbox that has specific value like Currency.

Here’s the code:

    Private Sub txtNumberOnly_KeyPress(ByVal sender As Object, ByVal e As System.Windows.Forms.KeyPressEventArgs) Handles txtNumberOnly.KeyPress
        If (e.KeyChar < "0" OrElse e.KeyChar > "9") _
            AndAlso e.KeyChar <> ControlChars.Back AndAlso e.KeyChar <> "." AndAlso e.KeyChar <> "," Then
            'cancel keys
            e.Handled = True
        End If
    End Sub

After the first line (i.e. txtNumberOnly_KeyPress) you can add more characters that is allowed in a textbox named “txtNumberOnly”.
You may also download the zip file with VB.NET 2008 project.