Question

I am using two update panels in my aspx page. My page also contains other controls most of them are text boxes. some text boxes using ajaxwater mark extender. My problem is when the portion of the panels is updated the watermark textbox also updated. How can I preven this to happen?
My page is like

….some other controls and then

<asp:UpdatePanel runat="server" ID="upPanelTestRoll">
                        <ContentTemplate>
                            <fieldset style="height: 70px; float: left; width: 350px;">
                                <legend>Submission</legend>
                                <asp:CheckBox ID="chkSubmitted" runat="server" Height="25px" Width="25px" AutoPostBack="true" />
                                <label for="chkSubmitted">
                                    Submitted</label>
                                <label for="txtSubmissionDate">
                                    Submission Date</label>
                                <asp:TextBox ID="txtSubmissionDate" runat="server" Height="12px" Enabled="false"></asp:TextBox>
                                <cc1:CalendarExtender ID="txtSubmissionDate_CalendarExtender" runat="server" Enabled="True"
                                    TargetControlID="txtSubmissionDate">
                                </cc1:CalendarExtender>
                                <%--<asp:CheckBox ID="chkTestToAppear" runat="server" Height="25px" Width="25px" />
                            <label for="">
                                Test To Appear</label>--%>
                                <br />
                                <label for="txtAdmissionTestRoll">
                                    Admission Test Roll
                                </label>
                                <asp:TextBox ID="txtAdmissionTestRoll" runat="server" Enabled="false"></asp:TextBox>
                        </ContentTemplate>
                    </asp:UpdatePanel>

What to do to optimize the code?

Answer 1

Change the UpdatePanel.UpdateMode to Conditional.

The content of the UpdatePanel control is updated under the following
conditions: If the Update method of the UpdatePanel control is called
explicitly.

If a control is defined as a trigger by using the Triggers property of
the UpdatePanel control and causes a postback. In this scenario, the
control is an explicit trigger for updating the panel content. The
trigger control can be either inside or outside the UpdatePanel
control that defines the trigger.

If the ChildrenAsTriggers property is set to true and a child control
of the UpdatePanel control causes a postback. In this scenario, child
controls of the UpdatePanel control are implicit triggers for updating
the panel. Child controls of nested UpdatePanel controls do not cause
the outer UpdatePanel control to be updated unless they are explicitly
defined as triggers.