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How do I update only a panel on check changed?

<asp:UpdatePanel id="up1" runat="server" UpdateMode="Conditional" ChildrenAsTriggers="true">
<ContentTemplate>
<asp:CheckBox ID="chkParent" runat="server" autopostback="true" OnCheckedChanged="chkParent_OnCheckedChanged" />
<asp:DataList ID="ChildList" runat="server" OnItemDataBound="ChildList_OnItemDataBound">
</ContentTemplate>
</asp:UpdatePanel>
protected void chkParent_OnCheckedChanged(object sender, EventArgs e)
{
this.ChildList.DataSource = this.ChildValues;
this.ChildList.DataBind();
}
On check changed of parent, child gets updated but the entire page also loads. Any way to avoid it?

ASP UpdatePanel doesn't work when used in ContentPage

My code works fine when used in a normal webform. but when I use it in a webform using masterpages, It doesn't work.
page header : ~/Manager/BaseManager.master
and some nested master pages : Base.master > Pages.master > BaseManager.master
ASP
<asp:ScriptManager ID="ScriptManager1" runat="server"></asp:ScriptManager>
<asp:UpdatePanel ID="UpdatePanel1" runat="server" UpdateMode="Conditional">
<Triggers>
<asp:AsyncPostBackTrigger EventName="Click"
ControlID="btnUpdateEditPage" />
</Triggers>
<ContentTemplate>
<asp:Label ID="lblTest" runat="server" Text="Label"></asp:Label>
</ContentTemplate>
</asp:UpdatePanel>
<asp:Button ID="btnUpdateEditPage" CssClass="btnUpdateEditPage" runat="server"
Text="Button" OnClick="btnUpdateEditPage_Click" />
C#
protected void btnUpdateEditPage_Click(object sender, EventArgs e)
{
lblTest.Text += "**";
}

Do the following please:
1- Add UpdatePanel1.Update(); like the following:
protected void btnUpdateEditPage_Click(object sender, EventArgs e)
{
lblTest.Text += "**";
UpdatePanel1.Update();
//Your UpdatePanel should be UpdateMode="Conditional" as what you have now..
}
2- Put the button inside the update Panel
3- Remove the Trigger to not fire a post back, so your code has to be like:
<asp:ScriptManager ID="ScriptManager1" runat="server"></asp:ScriptManager>
<asp:UpdatePanel ID="UpdatePanel1" runat="server" UpdateMode="Conditional">
<ContentTemplate>
<asp:Label ID="lblTest" runat="server" Text="Label"></asp:Label>
<asp:Button ID="btnUpdateEditPage" CssClass="btnUpdateEditPage" runat="server"
Text="Button" OnClick="btnUpdateEditPage_Click" />
</ContentTemplate>
</asp:UpdatePanel>

Place the button inside UpdatePanel.

SOLVED.
I change
<form id="form1" runat="server" action="post">
to
<form id="form1" runat="server">
and my problem solved.
But why?!

update progress control not working in asp.net

I have defined an <asp:UpdatePanel> with an <asp:UpdateProgress> as
<asp:ScriptManager ID="sm1" runat="server"></asp:ScriptManager>
<asp:UpdatePanel ID="update1" runat="server">
<ContentTemplate>
<asp:Label id="lblresult" runat="server"></asp:Label><br /><br />
<asp:Button ID="btn1" runat="server" Text="Refresh" OnClick="btn1_Click" /> <br />
</ContentTemplate>
</asp:UpdatePanel>
<asp:UpdateProgress ID="up1" runat="server" AssociatedUpdatePanelID="update1">
<ProgressTemplate>
<span style="color:green; font-style:italic;">Loading, please wait...</span>
</ProgressTemplate>
</asp:UpdateProgress>
The button event is defined as
protected void btn1_Click(object sender, EventArgs e)
{
lblresult.Text = "<span style='color:red;'>"+ DateTime.Now.ToString() +"</span>";
}
However, I do not get the Loading, please wait...

<script type="text/javascript">
var updateProgress = null;
function postbackButtonClick() {
updateProgress = $find("<%= uprMaster.ClientID %>");
window.setTimeout("updateProgress.set_visible(true)", updateProgress.get_displayAfter());
return true;
}
</script>
<asp:Button runat="server" Text="Search" ID="btnSearch" OnClick="btnSearch_Click" ClientIDMode="Static" OnClientClick="return postbackButtonClick();" />

put the update progress inside
like this
<asp:ScriptManager ID="sm1" runat="server"></asp:ScriptManager>
<asp:UpdatePanel ID="update1" runat="server">
<ContentTemplate>
<asp:UpdateProgress ID="up1" runat="server" AssociatedUpdatePanelID="update1">
<ProgressTemplate>
<span style="color:green; font-style:italic;">Loading, please wait...</span>
</ProgressTemplate>
<asp:Label id="lblresult" runat="server"></asp:Label><br /><br />
<asp:Button ID="btn1" runat="server" Text="Refresh" OnClick="btn1_Click" /> <br />
</ContentTemplate>
</asp:UpdatePanel>
</asp:UpdateProgress>

Autopostback is working only for the first time in ASP.NET?

Here i am using a radio button to calculate the date difference between two textboxes and i am showing it in another textbox.It is working only for the first time when i click the radio button after that it is not working..Here is my code
<asp:RadioButton ID="rdoSpecifiedDates" runat="server" class="bodycontent" GroupName="status"/>
<asp:RadioButton ID="rdoDateRange" runat="server" class="bodycontent"
GroupName="status" oncheckedchanged="rdoDateRange_CheckedChanged" AutoPostBack="true"
/>
<asp:UpdatePanel ID="Update" runat="server">
<ContentTemplate>
<asp:TextBox ID="txtDays" runat="server" CssClass="bodycontent" MaxLength="6" ReadOnly="true"></asp:TextBox>
</ContentTemplate>
<Triggers>
<asp:AsyncPostBackTrigger ControlID="rdoDateRange" />
</Triggers>
</asp:UpdatePanel>
and
protected void rdoDateRange_CheckedChanged(object sender, EventArgs e)
{
DateTime startdate=Convert.ToDateTime(txtOStartDate.Text);
DateTime enddate=Convert.ToDateTime(txtOEndDate.Text);
var result = (enddate - startdate).TotalDays;
txtDays.Text =Convert.ToString( result);
}
Any suggestion?

its happening because you are forcing only post back on rdoDateRange...and when the other rdoSpecifiedDates is clicked no postback occur so that's why you rdoDateRange dose not reflect any change..
So make the rdoSpecifiedDates AutoPostBack = true.
hmm...either you have to put both rdobuttons in your trigger.. like this
<asp:RadioButton ID="rdoSpecifiedDates" runat="server" AutoPostBack="true" class="bodycontent" GroupName="status" />
<asp:RadioButton ID="rdoDateRange" runat="server" class="bodycontent" GroupName="status"
OnCheckedChanged="rdoDateRange_CheckedChanged" AutoPostBack="true" />
<asp:UpdatePanel ID="Update" runat="server">
<ContentTemplate>
<asp:TextBox ID="txtDays" runat="server" CssClass="bodycontent" MaxLength="6" ReadOnly="true"></asp:TextBox>
</ContentTemplate>
<Triggers>
<asp:AsyncPostBackTrigger ControlID="rdoDateRange" />
<asp:AsyncPostBackTrigger ControlID="rdoSpecifiedDates" />
</Triggers>
</asp:UpdatePanel>
OR
Put both the radio buttons in update pannel like this..
<asp:UpdatePanel ID="Update" runat="server">
<ContentTemplate>
<asp:RadioButton ID="rdoSpecifiedDates" runat="server" AutoPostBack="true" class="bodycontent"
GroupName="status" />
<asp:RadioButton ID="rdoDateRange" runat="server" class="bodycontent" GroupName="status"
OnCheckedChanged="rdoDateRange_CheckedChanged" AutoPostBack="true" />
<asp:TextBox ID="txtDays" runat="server" CssClass="bodycontent" MaxLength="6" ReadOnly="true"></asp:TextBox>
</ContentTemplate>
<Triggers>
<asp:AsyncPostBackTrigger ControlID="rdoDateRange" />
</Triggers>
</asp:UpdatePanel>

You Also can do..:
<div>
<asp:RadioButton ID="rdoSpecifiedDates" runat="server" class="bodycontent"
GroupName="status" oncheckedchanged="rdoSpecifiedDates_CheckedChanged" AutoPostBack="true" />
<asp:RadioButton ID="rdoDateRange" runat="server" class="bodycontent" GroupName="status"
OnCheckedChanged="rdoDateRange_CheckedChanged" AutoPostBack="true" />
<asp:ScriptManager ID="ScriptManager1" runat="server" />
<asp:UpdatePanel ID="Update1" runat="server" UpdateMode="Conditional" >
<ContentTemplate>
<asp:TextBox ID="txtDays" runat="server" CssClass="bodycontent" MaxLength="6" Enable="False"></asp:TextBox>
</ContentTemplate>
</asp:UpdatePanel>
</div>
And
protected void rdoDateRange_CheckedChanged(object sender, EventArgs e)
{
DateTime startdate = DateTime.Now.AddHours(2);
DateTime enddate = DateTime.Now.AddHours(5);
TimeSpan result = enddate - startdate;
txtDays.Text = result.ToString();
Update1.Update();
}
protected void rdoSpecifiedDates_CheckedChanged(object sender, EventArgs e)
{
}

If your radio buttons are outside of the update panel (and need to be so), the selected/checked item will never fire due to not having any JavaScript on its <input> tag, which is logical in the sense that the page thinks the element is already selected so why would it need to fire off back to the server when it is clicked?
But it obviously causes issues in this scenario because, as triggers for an update panel, it never "repaints" itself to reflect that the selected item has changed.
My workaround for this is to "repaint" the radio buttons as well by having them in their own <asp:UpdatePanel> control:
<asp:UpdatePanel ID="RadioButtonUpdate" runat="server">
<ContentTemplate>
<asp:RadioButton ID="rdoSpecifiedDates" runat="server" class="bodycontent"
GroupName="status" OnCheckedChanged="rdoSpecifiedDates_CheckedChanged" AutoPostBack="true" />
<asp:RadioButton ID="rdoDateRange" runat="server" class="bodycontent"
GroupName="status" OnCheckedChanged="rdoDateRange_CheckedChanged" AutoPostBack="true" />
</ContentTemplate>
</asp:UpdatePanel>
<asp:UpdatePanel ID="Update" runat="server">
<ContentTemplate>
<asp:TextBox ID="txtDays" runat="server" CssClass="bodycontent" MaxLength="6" ReadOnly="true"></asp:TextBox>
</ContentTemplate>
<Triggers>
<asp:AsyncPostBackTrigger ControlID="rdoDateRange" />
</Triggers>
</asp:UpdatePanel>
This feels to me like the cleanest solution outside of housing the radio buttons within the update panel you are wanting refreshed.

ASP.NET: ModalPopupExtender prevents button click event from firing

Here is what I'm trying to do: Click a button on my page, which in turn makes (2) things happen:
Display a ModalPopup to prevent the user from pressing any buttons or changing values
Call my code behind method, hiding the ModalPopup when finished
Here is the ASP markup:
<asp:UpdatePanel ID="UpdatePanel2" runat="server" ChildrenAsTriggers="true"
UpdateMode="Always">
<Triggers>
<asp:AsyncPostBackTrigger ControlID="btnSaveData" EventName="Click" />
</Triggers>
<ContentTemplate>
<asp:Panel ID="pnlHidden" runat="server" style="display: none;">
<div>
<h1>Saving...</h1>
</div>
</asp:Panel>
<cc1:ModalPopupExtender ID="modalPopup"
BackgroundCssClass="modalBackground" runat="server"
TargetControlID="btnSaveData" PopupControlID="pnlHidden"
BehaviorID="ShowModal">
</cc1:ModalPopupExtender>
<asp:Button ID="btnSaveData" runat="server" Text="Save Data"
OnClick="btnSaveData_Click" />
</ContentTemplate>
</asp:UpdatePanel>
Now, here is my code behind C# code:
protected void btnSaveData_Click(object sender, EventArgs e)
{
UpdateUserData(GetLoggedInUser());
modalPopup.Enabled = false;
}
Why doesn't this work? The ModalPopup displays perfectly, but the btnSaveData_Click event NEVER fires.
UPDATE: The first suggestion did not work for me. I also tried your second suggestion (insofar as it applied to me). One minor difference on my end is that there is no button on my modal panel (pnlHidden) -- it's just a message. I did try using Javascript events on the client side, which at least did fire concurrently with my server-side event. This was good news, but I can't seem to find or grab a handle on the ModalPopupExtender or its BehaviorID. This doesn't work:
function showOverlay() {
var popup = $find('modalPopup');
popup.show();
}
popup is ALWAYS equal to null.
FINAL UPDATE: This is my final solution for getting this to work (Take specific note of the use of OnClientClick AND OnClick):
<asp:UpdatePanel ID="UpdatePanel2" runat="server" ChildrenAsTriggers="true"
UpdateMode="Always">
<Triggers>
<asp:AsyncPostBackTrigger ControlID="btnSaveData" EventName="Click" />
</Triggers>
<ContentTemplate>
<asp:Panel ID="pnlHidden" runat="server" style="display: none;">
<div>
<h1>Saving...</h1>
</div>
</asp:Panel>
<cc1:ModalPopupExtender ID="modalPopup"
BackgroundCssClass="modalBackground" runat="server"
TargetControlID="hdnField" PopupControlID="pnlHidden"
BehaviorID="ShowModal">
<asp:HiddenField ID="hdnField" runat="server" />
</cc1:ModalPopupExtender>
<asp:Button ID="btnSaveData" runat="server" Text="Save Data"
OnClientClick="showModal();" OnClick="btnSaveData_Click" />
</ContentTemplate>
</asp:UpdatePanel>
Using this Javascript function:
function showModal() { $find('ShowModal').show(); }
... And this code behind:
protected void btnSaveData_Click(object sender, EventArgs e)
{
UpdateUserData(GetLoggedInUser());
modalPopup.hide();
}

Try this.
Create a dummy hidden field:
<asp:HiddenField ID="hdnField" runat="server" />
Set the TargetcontrolID = "hdnField" in your Modal Popup declaration.
In your btnSaveData_Click event, do this:
modalPopup.Show();

Try this. It is 100% working
<asp:UpdatePanel ID="UpdatePanel1" runat="server">
<ContentTemplate>
<asp:Button ID="Btnshow" runat="server" Text="Show" OnClick="Btnshow_Click" />
<asp:Button ID="BtnTarget" runat="server" Text="Target" Style="display: none" />
<asp:TextBox ID="TextBox1" runat="server">
</asp:TextBox>
<input type="button" value="Get" onclick="abc()" />
<asp:ModalPopupExtender ID="ModalPopupExtender1" runat="server" TargetControlID="BtnTarget"
PopupControlID="Panel1">
</asp:ModalPopupExtender>
<asp:Panel ID="Panel1" runat="server" BackColor="Black" Width="300px" Height="300px">
<asp:UpdatePanel ID="UpdatePanel2" runat="server" ChildrenAsTriggers="false" UpdateMode="Conditional">
<ContentTemplate>
<asp:Button ID="BtnHide" runat="server" Text="Hide Button" OnClick="BtnHide_Click" />
</ContentTemplate>
<Triggers>
<asp:AsyncPostBackTrigger ControlID="BtnHide" EventName="Click" />
</Triggers>
</asp:UpdatePanel>
</asp:Panel>
</ContentTemplate>
<Triggers>
<asp:AsyncPostBackTrigger ControlID="Btnshow" EventName="Click" />
</Triggers>
</asp:UpdatePanel>
Server side code
protected void Btnshow_Click(object sender, EventArgs e)
{
ModalPopupExtender1.Show();
}
protected void BtnHide_Click(object sender, EventArgs e)
{
ModalPopupExtender1.Hide();
}

First attempt: Try to set your ButtonID into OkControlID Tag and try again
OR
Second attempt: Call your event over javascript there seems to be some problems with click events
<div>
<cc1:ModalPopupExtender PopupControlID="Panel1"
ID="ModalPopupExtender1"
runat="server" TargetControlID="LinkButton1" OkControlID="Ok"
OnOkScript="__doPostBack('Ok','')">
</cc1:ModalPopupExtender>
<asp:LinkButton ID="LinkButton1" runat="server">LinkButton</asp:LinkButton>
</div>
<asp:Panel ID="Panel1" runat="server">
<asp:Button ID="Ok" runat="server" Text="Ok" onclick="Ok_Click" />
</asp:Panel>

From this example you can easily control panel show up depends on conditions instead of just immediately show up panel once you click button.
<asp:Button ID="btnAdd" runat="server" OnClick="btnAdd_Click"/>
<asp:HiddenField ID="hdnField" runat="server" />
<ajaxToolkit:ModalPopupExtender runat="server"
TargetControlID="hdnField"
ID="btnAdd_ModalPopupExtender"
PopupControlID="pnlPrintName">
</ajaxToolkit:ModalPopupExtender>
<asp:Panel ID="pnlPrintName" runat="server">
.
.
</asp:Panel>
//Server side code:
protected void btnAdd_Click(object sender, EventArgs e)
{
if( dt.Rows.Count == 0 )
{
btnAdd_ModalPopupExtender.Show();
}
else
{
add();
}
}

In code behind, you can do this:
if (true)
{
var script = #"Sys.Application.add_load(function() { $find('behavoirIDModal').show(); });";
ScriptManager.RegisterStartupScript(this, GetType(), "Show", script, true);
}
Change this 'behavoirIDModal'