WHat data type to use allow user only put number and string..

Hey all..

Just a question that...what kind of data type that only allow user put only number and string in textbox..I ask this cuz.. I want to make a text box that allow user put a number for ex like this :

"15.7 In"
then after click on button convert it will convert to "cm" show up on the label..

but when i use data type string..user still can't put some thing that i don't repect likes this: "sfgfsfgsfgs in"

So how can we fix them..

and by the way..how can we use funtion right() to catch 2 last string on textbox ... I try it..but it had error..If some one has a sample code for this convertion...will be must appreciated..

Plz help..

Thanks

:D :D :D

VB Code:

Private Sub TextBox1_KeyPress(ByVal sender As Object, ByVal e As System.Windows.Forms.KeyPressEventArgs) Handles TextBox1.KeyPress
 
        Select Case e.KeyChar
            Case "1", "2", "3", "4", "5", "6", "7", "8", "9", "0", "i", "n", " ", "."
                e.Handled = False '/// allow these.
            Case Else
                e.Handled = True '/// stop all other chars.
        End Select
 
    End Sub

Or you can validate with IsNumber & IsLetter functions .