Update panel automatically clears textboxes - asp.net

Question

I'm trying to combine an event of automatic printing of messages in case the passwords will not match. For that purpose I'm using an Update panel.
The Error message prints perfectly My problem is that both text-boxes automatically created after it. even thought I don't specify it in the code. I can't understand what have I done wrong.
This is the code for front end:
<asp:TextBox ID="NonPass1" runat="server" TextMode="Password"></asp:TextBox>
<asp:TextBox ID="NonPass2" runat="server" TextMode="Password" autopostback="True"></asp:TextBox>
<asp:UpdatePanel ID="UpdatePanel6" runat="server">
<ContentTemplate>
<asp:Panel ID="Panel6" runat="server">
<asp:Label ID="Label1" class="errorMess" runat="server" Text="The Passwords do not match!!!"></asp:Label>
</asp:Panel>
</ContentTemplate>
<Triggers>
<asp:AsyncPostBackTrigger ControlID="NonPass2" EventName="TextChanged" />
</Triggers>
</asp:UpdatePanel>
this is the back end code(I'm using VB):
Protected Sub NonPass2_TextChanged(ByVal sender As Object, ByVal e As EventArgs) Handles NonPass2.TextChanged
If NonPass1.Text <> NonPass2.Text Then
Panel3.Visible = False
Panel6.Visible = True
Else
Panel3.Visible = False
Panel6.Visible = False
End If
End Sub

Answer 1

maybe you can use javascript functions.
<script>
var t1 = false; // textbox1 onfocus triggered = true;
var t2 = false; // textbox2 onfocus triggered = true;
function clearTBox() {
if (t1 && t2) {
if (document.getElementById("textbox1Name").value != document.getElementById("textbox1Name2").value) {
alert("Insert your code here");
}
}
}
</script>

Answer 2

Heres what i use in c# for this, maybe you can inherit the technique
private void ClearTextBoxes()
{
Action<Control.ControlCollection> func = null;
func = (controls) =>
{
foreach (Control control in controls)
if (control is TextBox)
(control as TextBox).Clear();
else
func(control.Controls);
};
func(Controls);
}
then call cleartextboxes();
Hope that helped :)

Answer 3

what do you mean :
My problem is that both text-boxes automatically created after it
please, make your question more clearance
Try not to use updatepanel,
try this
<asp:TextBox ID="NonPass1" runat="server" TextMode="Password"></asp:TextBox>
<asp:TextBox ID="NonPass2" runat="server" TextMode="Password" autopostback="True"></asp:TextBox>
<div id="Div_Error" runat="server" visible="false" style="width:100%">
<asp:Label ID="Label1" class="errorMess" runat="server" Text="The Passwords do not match!!!"></asp:Label>
and use this in the code behind:
Protected Sub NonPass2_TextChanged(ByVal sender As Object, ByVal e As EventArgs) Handles NonPass2.TextChanged
If NonPass1.Text <> NonPass2.Text Then
Div_Error.visible=true;
Else
Div_Error.visible=false;
End If
End Sub

Answer 4

The only logical reason for the behavior as you described is perhaps, you put the above password boxes inside another UpdatePanel.
Therefore, the password boxes will be reloaded on postbacks (textchanged event), and TextBox of type Password do not retain its value after postbacks for security reason.
Though, if security is not a concern for you, there is a workaround to 'avoid' the password textboxes from being cleared on postbacks, by reassigning their values every time postbacks occur. Just include the following codes in the page Load event.
Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
NonPass1.Attributes.Add("value", NonPass1.Text)
NonPass2.Attributes.Add("value", NonPass2.Text)
End Sub

Answer 5

this is a simple example:
<table class="mytable" cellspacing="0" style="width: 100%">
<tr>
<td>
<asp:TextBox ID="Txt_Pass" runat="server" ></asp:TextBox>
</td>
<td>
<asp:TextBox ID="Txt_Re_Pass" runat="server" ></asp:TextBox>
</td>
<td width="66%" align="left">
<asp:Button ID="Btn_Filter" runat="server" Text="" Height="22px" />
</td>
</tr>
</table>
<br />
<div id="Div_Error" runat="server" visible="false" style="width:100%">
<asp:Label ID="lbl_Error" runat="server" class="msg">
</asp:Label>
</div>
and in the code behind , use this:
Protected Sub Btn_Filter_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles Btn_Filter.Click
If Trim(Txt_Re_Pass.Text) <> "" Then
Div_Error.Visible = False
if Txt_Pass.Text <> Txt_Re_Pass.Text then
Div_Error.Visible = True
lbl_Error.text="The Passwords do not match!!!""
else
Div_Error.Visible = False
End if
Else
Div_Error.Visible = True
lbl_Error.text="Please re enter your password"
End If
End Sub