Show Hide DIV or Panel after Postback

I am having difficulty showing a hidden DIV or ASP.net Panel on postback.

I submit a page that adds items to a database then sends an email.  Those items work perfect.  However, I want a message to show up saying that it was successful.  My understanding from what I have read is that if you are using a Panel with visibility set to False that it will not be rendered, therefore you cannot set it back to visibile from the server side.  

I've also tried setting the DIV style via javascript and have not been successful.

As the insert to the database takes place an ajax update panel does show.  But for some reason the portion to show the "success" message  will not trigger.

I know that I am rambling, but just frustrated.

Here is the portion that should show after the insert and email "Success Message":
(currently set for trying to change the style. Tried visibility:hidden/visible too)
 
<div id="SubmittedPanelWrapper" runat="server" style="display: block" >
             <div id="SubmittedBackgroundFilter"></div>
            <div id="SubmittedMessage"> 
                
                         <center> 
                          The change has been submitted.<br /> You will receive an email once the change is complete.<br /> <br />
                             <asp:Button ID="SubmittedOK" runat="server" Text="OK" CssClass="submitButton" />
                         </center> 
                            </div>
                         </div>

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Associated CSS for the Success Message:
 
#SubmittedBackgroundFilter {
    position:fixed;
    top:0px;
    bottom:0px;
    left:0px;
    right:0px;
    overflow:hidden;
    padding:0;
    margin:0;
    background-color:#000;
    filter:alpha(opacity=50);
    opacity:0.5;
    z-index:1000;
}#SubmittedMessage {
    position:fixed;
    top:30%;
    left:43%;
    padding:10px;
    width:14%;
    z-index:1001;
    background-color:#fff;
    border:solid 1px #000;
}
.submitButton
{
    text-align: right;
    padding-right: 10px;
}

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The submit button (visibile set to true from code behind once certain criteria are met, works):
 
<asp:Button ID="SubmitButton" runat="server" Text="Submit Changes"  
                style="text-align: center" Visible="false" 
                "/>

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The Sub:
 
Protected Sub SubmitButton_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles SubmitButton.Click
        SqlDataSourceInsertClientUpdate.Insert() ' <- Works 
        SendIANotificationEmail()  ' <- Works
        ' This is where I would set a trigger to show the "Success" Message
        ' I've tried SubmittedPanelWrapper.Style.Add("display", "block")
        ' I've tried this with a panel as well.
        ' I've tried PanelChangeSubmitted.visible = True  ** The panel code is no longer in the aspx page.  But this is how I tried to activate it when it was.
        ' I've tried setting the style by javascript and using the onClientClick.

    End Sub

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I have even setup a new asp button and tried to trigger off of it, thinking it had something to do with the timing of the postback.  But it didn't work either.

Any help in the right direction would be appreciated.
ITMcmcpaAsked:
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guru_samiConnect With a Mentor Commented:
You said you are using UpdatePanel correct? So if your postback is coming from UP and your message panel is outside of that panel, it won't be update. Make sure your MessagePanel is also inside of UP.
If that is not the case let us know.
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sindhuxyzCommented:
If you want to control  <div id="SubmittedMessage">  from code behind for visibility then add runat="server" tag, you will be able to access div from code behind.

 <div id="SubmittedMessage" runat="server">


code behind
---------------

SubmittedMessage.visible=false
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ITMcmcpaAuthor Commented:
Unfortunately that does not work. SubmittedPanelWrapper has the runat="server" and I can access the visibile attribute from the Code Behind, but it does not trigger.  There is no error message.
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sindhuxyzCommented:
Please post code where you have made panel's visibility false/true and also your page_load event too.
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ITMcmcpaAuthor Commented:
This is how I tried setting up the panel:
 
<asp:Panel ID="PanelChangeSubmitted" runat="server" Visible="false">
     <div id="SubmittedPanelWrapper" runat="server" >
             <div id="SubmittedBackgroundFilter"></div>
            <div id="SubmittedMessage"> 
                
                         <center> 
                          The change has been submitted.<br /> You will receive an email once the change is complete.<br /> <br />
                             <asp:Button ID="SubmittedOK" runat="server" Text="OK" CssClass="submitButton" />
                         </center> 
                            </div>
                         </div>
                         </asp:Panel>

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The Submit Button:
 
Protected Sub SubmitButton_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles SubmitButton.Click
        SqlDataSourceInsertClientUpdate.Insert() ' <- Works 
        SendIANotificationEmail()  ' <- Works
        PanelChangeSubmitted.Visible = True ' <-doesn't work
    End Sub

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page_load:
 
'set logged in user for credential validation
      


        Dim CurrentUserName As String = Environment.UserName
        Try
            TBUser.Text = Session("loggedinas").ToString()
        Catch ex As Exception
            Response.Redirect("~/sessionint.aspx")
        End Try


        ' PanelChangeSubmitted.Visible = False
        LBLloggedInUserCPaaa.Text = CurrentUserName
        LBLwarning1aaa.Visible = True
        TBDateTimeofEntry.Text = Now()

        SetWarningLabel()



        'set title of page in the site.master
        Dim myLabel As Label
        myLabel = CType(Master.FindControl("LBLHeaderTitle"), Label)
        If Not myLabel Is Nothing Then

            myLabel.Text = "Client Update Form"
        End If



        'lookup rights for viewing update client list link

        Dim dvSqlCUlist As DataView =
       DirectCast(SqlDataSource4AccessClientUpdateList.Select(DataSourceSelectArguments.Empty), DataView)
        For Each drvSqlCUlist As DataRowView In dvSqlCUlist
            If drvSqlCUlist("userclientupdatelist").ToString() = "True" Then


                ListViewerHyperLink.Visible = True

            Else

                ListViewerHyperLink.Visible = False
            End If

        Next

    End Sub

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sindhuxyzCommented:
can you try like below

// To hide:
 Panel1.Style.Add("display", "none");
// To show:
 Panel1.Style.Add("display", "block");
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ITMcmcpaAuthor Commented:
I've tried it once.. but I will try again.
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sindhuxyzCommented:
before you try above; remove Visible="false" from panel
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ITMcmcpaAuthor Commented:
right
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ITMcmcpaAuthor Commented:
I put the hide in the page load.  It does hide the panel.  But the show does not work.
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ITMcmcpaAuthor Commented:
That was exactly it.  It works now.
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