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Webbrowser control not updating properly

NevSoFly asked
Last Modified: 2014-01-05
I am trying to create a calculator with an html display.  I am using the below code to create an html string for the number and decimal point input.  The code works perfectly for creating the string (WB) but does not always update the webbrowser control properly.  
    Private Sub Buttonnum(btn As Button, e As EventArgs) Handles btn0.Click, btn1.Click, btn2.Click, btn3.Click, btn4.Click,
                                                                 btn5.Click, btn6.Click, btn7.Click, btn8.Click, btn9.Click,
                                                                 btna.Click, btnb.Click, btnx.Click, btny.Click, btnz.Click,
        Dim WB As String = WB2.DocumentText

        If WB = String.Empty Then
            WB = "<p dir=""RTL"">"
            If WB.Substring(WB.Length - 4) = "</p>" Then            'checks to see if "</p>" is at the end of the string.
                WB = WB.Substring(0, WB.Length - 4)   'of the string.  If it is it removes it.
            End If
        End If

        If List.Count > 0 Then
            Select Case List(List.Count - 1)
                Case "*", "+", "-", "/"
                    If btn.Text = "." Then
                        WB += "0" & btn.Text
                        WB += btn.Text
                    End If
                Case CChar(CStr(0)) To CChar(CStr(9))
                    WB += btn.Text
            End Select
            If btn.Text = "." Then
                WB += "0" & btn.Text
                WB += btn.Text
            End If
        End If

        WB += "</p>"

        WB2.DocumentText = WB

    End Sub

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For example if I was to enter 12.3 when I press 1 then 2 ,"12" is displayed (this is good),
then when I press the decimal button ".12" is displayed (it should be 12.) I checked the value of WB and it is "12." (as it should be).
When I press 3 nothing changes ".12" is still displayed.  I then press 3 a second time and "12.3" is displayed but the value of WB is "12.33"

I have read similar issues on the web but have found no solutions.

Any suggestions?
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