asp:FileUpload control is getting postback on first time

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Hi
In my form im using update panel inside update panel im using panel.

Inside panel im asp:FileUpload control and a upload button.
When i browse any zip file and click upload button first time .hasfile is becoming false becuase of postback of fileupload control.when i upload second time its becoming true and working correctly.
Pls suggest me why the upload conntrol is postbacking for first time...

additional information copied from comment below

ASP.NET

<asp:UpdatePanel ID="UpdatePanel1" runat="server" UpdateMode="Always">
   <contenttemplate>
                    <asp:Panel ID="pnlUpload" runat="server" Font-Names="Verdana" Font-Size="11px" Style="padding: 0px 0px 0px 0px;
                        border: 1px; border-color: #A5C5DE; border-style: solid;" Height="120px" Width="100%">
                        <table style="width: 100%;">
                            <tr>
                                <td>
                                    <div id="dvzip"  runat="server" class="form" style="background-color: #ffffff !important;
                                        width: 100%; vertical-align: top">
                                        <fieldset class="curve_qp">
                                            <legend class="curve_qp">Import ZipFile</legend>
                                            <table id="tblzip"  runat="server">
                                                <tr>
                                                    <td align="right" class="label" style="width: 25%;">
                                                        Password <span class="mandatory_field">*</span>
                                                    </td>
                                                    <td colspan="2" style="width: 75%;">
                                                        <asp:TextBox ID="txtSessionPassword" TextMode="MultiLine" runat="server" CssClass="formContent"
                                                            Width="100%" Height="50px">
                                                    </td>
                                                </tr>
                                                <tr>
                                                    <td class="label" style="width: 25%;" align="right">
                                                        Choose the FileName to Upload <span class="mandatory_field">*</span>
                                                    </td>
                                                    <td style="width: 55%;">
                                                        <%--<asp:FileUpload ID="filezip" runat="server" CssClass="border" Width="100%" Height="20px"
                                                                BorderWidth="1px" OnInit="filezip_Init" />--%>
                                                        <asp:FileUpload ID="filezip" runat="server" CssClass="border" Width="100%" Height="20px"
                                                            BorderWidth="1px" />
                                                    </td>
                                                    <td style="width: 20%;">
                                                        <asp:Button ID="btnUpload" runat="server" Text="Upload" CssClass="formbtn curve_qp label"
                                                            Width="108px" OnClick="btnUpload_Click" />
                                                    </td>
                                                </tr>
                                            </table>
                                        </fieldset>
                                    </div>
                                </td>
                            </tr>
                        </table>
                    
                </contenttemplate>
                <Triggers>
                    <asp:AsyncPostBackTrigger ControlID="btnUpload"  EventName="btnUpload_Click"/>
                    
                </Triggers>

Posted 9-Dec-13 19:19pm

Member 9700867

Updated 9-Dec-13 21:09pm

Nelek

v2

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Comments

jackspero18 10-Dec-13 1:26am

You Can't use file upload control in Update panel directly..
you must use trigger for that button

2 solutions

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jackspero18 · Answer 1 · 2013-12-09T19:28:00

Solution 2

In update panel use triggers

ASP.NET

<triggers>
        <asp:postbacktrigger controlid="Uploadbutton" xmlns:asp="#unknown" />

        </triggers>

Posted 9-Dec-13 19:28pm

jackspero18

Updated 9-Dec-13 19:30pm

v2

sankarsan parida · Answer 2 · 2013-12-09T20:49:00

Add the asp:postbacktrigger for the UpdatePanel and give the ControlID.
See the code below which will help you.

XML

<asp:UpdatePanel ID="UpdatePanel1" runat="server" UpdateMode="conditional">
            <Triggers>
                <asp:PostBackTrigger ControlID="Button1" />
            </Triggers>
            <ContentTemplate>
                <asp:Panel runat="server">
                    <asp:FileUpload ID="FileUpload1" runat="server" />
                    <asp:Button ID="Button1" runat="server" Text="Upload" OnClick="Button1_Click" />
                </asp:Panel>
            </ContentTemplate>
        </asp:UpdatePanel>