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update panel not working in where upload excel sheet

If i am using update panel then PostedFile not giving file path some error are coming and if update panel are removed the page then excel file successfully upload how to solve

your code should be as shown below
<asp:UpdatePanel runat="server" ID="UpdatePanel1" UpdateMode="Conditional">
<ContentTemplate>
<asp:FileUpload runat="server" ID="flFile" />
<asp:Button runat="server" ID="btnSubmit" Text="Upload" OnClick="btnSubmit_Click" />
</ContentTemplate>
<Triggers>
<asp:PostBackTrigger ControlID="btnSubmit" />
</Triggers>
</asp:UpdatePanel>
You need to put postback trigger if you are uploading any files.

A FileUpload inside UpdatePanel won't work. You have to post the whole page. You do this by adding a PostBackTrigger to the button you use for uploading files.
Something like this (see Triggers):
<asp:UpdatePanel ID="upnlMain" runat="server" UpdateMode="Conditional">
<ContentTemplate>
<asp:FileUpload ID="fileUpload" runat="server" Width="400px" />
<asp:Button ID="btnUploadFiles" runat="server" Text="Upload files" />
</ContentTemplate>
<Triggers>
<asp:PostBackTrigger ControlID="btnUploadFiles" />
</Triggers>
</asp:UpdatePanel>
If you have problems with not posting the first time a button is clicked then add this to Page Load event:
Page.Form.Attributes.Add("enctype", "multipart/form-data");

How to active AsyncPostBackTrigger in Update Panel?

I created a updatePanel, is include some dropdownlist and a few button and I use AsyncPostBackTrigger for not update all page when the click button or select dropdownlist.
My page structure that an aspx page and also use user control page. I use updatePanel on UserControlPage.
Here is My code and I wish you help me:
<asp:UpdatePanel ID="UpdMonthly" runat="server" UpdateMode="Conditional">
<ContentTemplate>
<asp:DropDownList ID="ddlSenetIslemleriAlinanUrun1" AutoPostBack="true" OnSelectedIndexChanged="ddlSenetIslemleriAlinanUrun1_SelectedIndexChanged" runat="server"></asp:DropDownList>
<asp:PlaceHolder ID="PlaceHolder1" runat="server"></asp:PlaceHolder>
<asp:Button ID="btnKaydet" style="margin:10px ;" Width="100" Height="50" runat="server" Text="Kaydet" OnClick="btnKaydet_Click"/>
</ContentTemplate>
<Triggers>
<asp:AsyncPostBackTrigger ControlID="ddlSenetIslemleriAlinanUrun1" EventName="Click" />
<asp:AsyncPostBackTrigger ControlID="btnKaydet" EventName="Click" />
</Triggers>
</asp:UpdatePanel>
I have some knowledge on placeholder but when the click dropdown or button, page is postback and placeholder knowledge dissappear.
how to fix postback problem?
Thanks for your answers.

FileUpload component empty on AsyncPostBack

I have an AJAX UpdatePanel and a GridView inside it. A FileUpload component outside the updatepanel.
<asp:FileUpload ID="documentUpload" runat="server" />
<asp:Button ID="btnUploadDocumentDetails" runat="server" OnClick="btnUploadDocumentDetails_Click" />
<asp:UpdatePanel ID="UpdatePanel_DocumentDetails" runat="server">
<Triggers>
<asp:AsyncPostBackTrigger ControlID="btnuploaddocumentdetails" EventName="Click" />
</Triggers>
<ContentTemplate>
<asp:GridView ID="gvDocuments" runat="server"></asp:GridView>
</ContentTemplate>
</asp:UpdatePanel>
On button click I have to upload the file on the server and update the GridView (gridview contains the list of all files).
Problem:
When I click on the button to upload the file, the FileUpload component gets empty (HasFile attribute returns false).
How can I resolve this issue to asynchronously update the GridView?

Not able to enable Panel which is outside the update panel from the update panel in asp.net

Here is the scenario,
I have one update panel in which I have radio button.
On check of radio button I want to enable Panel which is outside the update panel.
I have tried following 2 things:
Placing the panel in another update panel didn't work.
Using JavaScript on click of radio button didn't work.

placing the panel in another updatepanel and set update mode as conditional.
You need to do one more thing
On check of radio button event you need to call update method of newly added update panel
UpdatePanel1.Update();

I hope this code sample helps you.
<asp:UpdatePanel ID="udp1" runat="server" UpdateMode="Conditional">
<ContentTemplate>
<asp:RadioButton ID="rb1" runat="server" AutoPostBack="true" OnCheckedChanged="Control_CheckedChanged"
Text="Text" GroupName="Group1" />
<asp:RadioButton ID="rb2" runat="server" AutoPostBack="true" OnCheckedChanged="Control_CheckedChanged"
Text="Text2" GroupName="Group1" />
</ContentTemplate>
</asp:UpdatePanel>
<asp:UpdatePanel ID="udp2" runat="server" UpdateMode="Conditional">
<ContentTemplate>
<asp:Panel ID="pnl1" runat="server" Visible="false">
<asp:Label ID="lblText" runat="server" Text="Text"/>
</asp:Panel>
</ContentTemplate>
<asp:AsyncPostBackTrigger ControlID="rb1" />
<asp:AsyncPostBackTrigger ControlID="rb2" />
</asp:UpdatePanel>
protected void Control_CheckedChanged(object source, EventArgs e)
{
pnl1.Visible=rb1.Checked;
}

Working with multiple update panels and timer dedicated to specific updatepanel

I have the code on master page as follows:
<asp:Timer ID="Timer1" runat="server" Interval="10000" ontick="Timer1_Tick"></asp:Timer>
<asp:UpdatePanel ID="updateNotifications" runat="server" UpdateMode="Conditional">
<Triggers>
<asp:AsyncPostBackTrigger ControlID="Timer1" EventName="Tick" />
</Triggers>
<ContentTemplate>
//Content
</ContentTemplate>
</asp:UpdatePanel>
This is working fine and refreshes the content with defined interval, but it also updates all the update panels on the content pages. I have to refresh only the content inside this update panel. I have tried UpdateMode="Conditional" and UpdateMode="Always" too but to no help.