Only allow numeric values in the textbox

Question

I want to make a TextBox control that only accepts numerical values.

How can I do this in VB6?

Answer 1

In the text box text Change event, check if the entered value is a number. If it's not a number then set the old value back again.

Dim textval As String
Dim numval As String

Private Sub TextBox1_Change()
  textval = TextBox1.Text
  If IsNumeric(textval) Then
    numval = textval
  Else
    TextBox1.Text = CStr(numval)
  End If
End Sub