c# - Asp.net button onclick not working in updatepanel -


my problem is, asp button's onclick not working inside updatepanel. code is, have asp fileupload control upload file. , afterwards, user can click button , filename of uploaded file displayed in asp label control.

but when tried it, not displaying filename in label. nothing.

here aspx:

   <asp:updatepanel runat="server" updatemode="always" id="updpnlname"      childrenastriggers="true">                          <contenttemplate>                               <asp:fileupload runat="server" id="image1"/>                                    <asp:button id="button2" runat="server"                                      text="upload" onclick="button2_click"/>                              </contenttemplate>                             <triggers>                                <asp:asyncpostbacktrigger controlid="button2"                                      eventname="click"/>                              </triggers>                      </asp:updatepanel>                      <asp:label id="label3" runat="server" text="label">   </asp:label>

here code-behind:

public void button2_click(object sender, eventargs e) {     var filename1 = image1.filename;     label3.text = "upload successfull - " + filename1; }

by way, reason why wanted use updatepanel avoid refreshing entire page when user clicked button. please kindly me on one.

place label inside updatepanel, should update label control's text value.


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