file upload control related button is not responding
<p>I have the following code on page. When I type a file name in fileupload control, the test button click stops responding and when I don't type anything in the fileupload control text box then the click button responds. I am not using ajax on the my page. I have script manager delared on my master page. Below is my code</p>

<pre><code>    &lt;asp:Content ID="Content2" ContentPlaceHolderID="ContentPlaceHolder1" runat="Server"&gt;
&lt;table width="100%" style="background-color: #E6E6E6"&gt;
            &lt;tr style="background-color: #E6E6E6"&gt;
                &lt;td&gt;
                    &lt;asp:Panel ID="panel" runat="server" CssClass="cis_edit_pnl" GroupingText="Master Configuration List"
                        Width="100%"&gt;
                        &lt;table width="100%"&gt;
                            &lt;tr&gt;
                                &lt;td style="width: 30px"&gt;
                                    &lt;asp:Label ID="lbl_MCL" runat="server" Text="MCL:" CssClass="cis_edit_label_tiny"&gt;&lt;/asp:Label&gt;
                                &lt;/td&gt;
                                &lt;td&gt;
                                    &lt;asp:FileUpload ID="AsyncFileUpload_MCL" runat="server" Width="400px" /&gt;
                                &lt;/td&gt;
                            &lt;/tr&gt;
                        &lt;/table&gt;
                        &lt;table align="center"&gt;
                            &lt;tr align="center"&gt;
                                &lt;td align="center"&gt;

                                &lt;asp:Button ID="test" runat="server" Text="test" onclick="test_Click" /&gt;
                                &lt;/td&gt;
                            &lt;/tr&gt;
                        &lt;/table&gt;
                    &lt;/asp:Panel&gt;
                    &lt;/td&gt;
            &lt;/tr&gt;
        &lt;/table&gt;
</code></pre>

<p></p>

<p>any help will be appreciated.</p>

<p>Thanks.</p>
