restrict values in a textbox

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how to restrict textbox entry in vb.net so that it accepts only numerical key and backspace to correct any error.

I am using this code:

VB

Private Sub TextBox3_KeyPress(ByVal sender As Object, ByVal e As System.Windows.Forms.KeyPressEventArgs) Handles TextBox3.KeyPress
        Dim allowedChars As String = "0123456789"

        If allowedChars.IndexOf(e.KeyChar) = -1 Then
            ' Invalid Character
            e.Handled = True
        End If

    End Sub

but its not including the backspace coding.
I need to allow backspace also. So please help.

Thanks!

Posted 9-Sep-10 1:11am

dahras

Updated 9-Sep-10 1:51am

Ankur^\m/

v3

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Om Prakash Pant · Answer 1 · 2010-09-09T01:24:00

Please check the following modified code:

Private Sub TextBox1_KeyPress(ByVal sender As Object, ByVal e As System.Windows.Forms.KeyPressEventArgs) Handles TextBox1.KeyPress
        Dim allowedChars As String = "0123456789"
        If e.KeyChar <> ControlChars.Back Then
            If allowedChars.IndexOf(e.KeyChar) = -1 Then
                'Invalid Character
                e.Handled = True
            End If
        End If
    End Sub

Goutam Patra · Answer 2 · 2010-09-09T01:30:00

Solution 2

Add this If Asc(e.KeyChar) = Asc(Keys.Back) Then Exit Sub before If allowedChars.IndexOf(e.KeyChar) = -1 Then.

Posted 9-Sep-10 1:30am

Goutam Patra