[VB] usage of NumericUpDown

[Manix]

Hello,

I have recently started programming with Visual Basic (2008 Express Edition) and I'm creating a program in which I need the user to input NUMBERS ONLY. After googling my issue I figured that I need to use NumericUpDown function or whatever it is called. My question is, since I'm a complete noob, how do I use it? I mean how do I make input of numbers only possible in a textbox?

Thanks in advance,

Manix.

 

[seph ir oth]

I'm not big in VB, so I don't know how this would go down, but write some code so that if the user types a key, and the text box was selected/inputted into when that key was typed, then you check what that key is (ASCII code ftw: http://www.asciitable.com/) and if it's not the range of numbers for 0-9, which is 48 through 59, then clear the text box of that key.

The NumericUpDown bit seems to be made for small numbers, though I'm sure you could make a second set of up-down arrows to make it increase by 10's, or 100's, etc.

http://www.exforsys.com/tutorials/vb.net-2005/domainupdown-and-numericupdown-in-vb.net-2005.html

 

[Vestras]

Use MaskedTextbox instead of a normal Textbox.

 

[Sintoras]

Or, if you want to do it by code, use a normal textbox, check if the input is numeric (textbox1.text.IsNumeric), if not, delete the last character, otherwise leave it.

 

[Im_On_56k]

Try something like this

    Private Sub TextBox1_KeyPress(ByVal sender As Object, ByVal e As System.Windows.Forms.KeyPressEventArgs) Handles TextBox1.KeyPress
        If Not Char.IsNumber(e.KeyChar) Then
            e.Handled = True
        End If
    End Sub

EDIT-
This allows backspace:

    Private Sub TextBox1_KeyPress(ByVal sender As Object, ByVal e As System.Windows.Forms.KeyPressEventArgs) Handles TextBox1.KeyPress
        If Char.IsNumber(e.KeyChar) Or e.KeyChar = ChrW(Keys.Back) Then
            e.Handled = False
        Else
            e.Handled = True
        End If
    End Sub