We Keep Coding

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.

Unable to upload photo asynchronously with FileUpload control using UpdatePanel

In my ASP.NET Web forms application, I am adding a feature to upload files but I don't want to do a full postback. So to make it asynchronous I thought of using UpdatePanel.
This UpdatePanel contains a FileUpload control and a button to upload the selected photo. When I was debuggin my code to detect if file is actually selected or not, I found FileUpload's HasFile property to be false.
It works when I remove UpdatePanel but I don't understand why.
To help you understand, here is the code:
ASPX markups:
<asp:UpdatePanel ID="UPProf" runat="server">
<ContentTemplate>
<asp:FileUpload ID="FUDP" runat="server" />
<asp:Button ID="BUDP" runat="server" OnClick="BUDP_Click" Text="Upload your photo" />
</ContentTemplate>
<Triggers>
<asp:AsyncPostBackTrigger ControlID="BUDP" EventName="Click" />
</Triggers>
</asp:UpdatePanel>
Here's its CS code:
protected void BUDP_Click(object sender, EventArgs e)
{
try
{
if (FUDP.HasFile) // code doesn't pass this if condition
{
FUDP.SaveAs("D:/Pictures/" + count + ".jpeg"); //it doesn't work since there is no file here
}
else
{
//Set some message for user
}
}
catch (Exception ex)
{
//log the error
}
}

Upload requires full page request. This is a limitation of the XmlHttpRequest component used in all AJAX frameworks for asynchronous calls to the application.
Remove the UpdatePanel or make BUDP button to perform postbacks.
<asp:UpdatePanel ID="UPProf" runat="server">
<ContentTemplate>
<asp:FileUpload ID="FUDP" runat="server" />
<asp:Button ID="BUDP" runat="server" OnClick="BUDP_Click"
Text="Upload your photo" />
</ContentTemplate>
<Triggers>
<asp:PostBackTrigger ControlID="BUDP" />
</Triggers>
</asp:UpdatePanel>

How to find child page control while using postback trigger

I am having one master page that has one update panel.
Content place holder is within the update panel
Now i have child page which has a File upload control
To make work File upload control, i have to put Postback trigger.
But question is where i can put that Postback trigger ??
If i put Postback trigger in Master page than it will give me error that control does not found
and i can't put Postback trigger because child page has not other update panel
What is the solution for this problem ?

Simply wrap the FileUpload with an UpdatePanel, which don't do anything and hasn't any side effect but will solve the problem.
<asp:UpdatePanel ID="UpdatePanel1" runat="server">
<ContentTemplate>
<asp:FileUpload ID="FileUpload1" runat="server" />
<asp:Button ID="btnSubmit" runat="server" Text="Button" />
</ContentTemplate>
<Triggers>
<asp:PostBackTrigger ControlID="btnSubmit" />
</Triggers>
</asp:UpdatePanel>

asyncfileupload inside update panel not triggering the upload method

I am having a asyncfileupload inside a update panel, I want to upload the file once when a file is selected , the same code works well outside the update panel but my design is in such a way that I can put this outside the update panel, how can I make this work
<asp:UpdatePanel ID="UP_DDL" runat="server" UpdateMode="Always" Visible="true"
RenderMode="Inline">
<ContentTemplate>
<asp:asyncfileupload id="AFU_Doc" runat="server"
uploadingbackcolor="Yellow" onuploadedcomplete="btnDocUpload_Click"
onclientuploadcomplete="sa" throbberid="spanUploading2" />
<span id="spanUploading2" runat="server">Uploading...</span>
</ContentTemplate>
<Triggers>
<asp:AsyncPostBackTrigger ControlID="AFU_Doc" />
</Triggers>
</asp:UpdatePanel>