 <pre><code>&lt;asp:Content ID="BodyContent" runat="server" ContentPlaceHolderID="ContentPlaceHolder1"&gt; &lt;asp:Panel ScrollBars="Auto" runat="server"&gt; &lt;asp:ValidationSummary ID="ValidationSummary1" runat="server" ValidationGroup="all" /&gt; &lt;table border="0" cellspacing="0" cellpadding="0"&gt; &lt;tr align="left" valign="middle"&gt; &lt;td class="font_01"&gt; From Date:&amp;nbsp; &lt;/td&gt; &lt;td&gt; &lt;asp:CustomValidator ID="cvCalFrom" runat="server" ValidationGroup="all" &gt;*&lt;/asp:CustomValidator&gt; &lt;uc3:Calendar ID="calFrom" DateString="" runat="server" /&gt; &lt;/td&gt; &lt;td&gt; &amp;nbsp;&amp;nbsp; &lt;/td&gt; &lt;td class="font_01"&gt; ToDate:&amp;nbsp; &lt;/td&gt; &lt;td&gt; &lt;asp:CustomValidator ID="cvCalTo" runat="server" ValidationGroup="all"&gt;*&lt;/asp:CustomValidator&gt; &lt;uc3:Calendar ID="calTo" DateString="" runat="server" /&gt; &lt;/td&gt; &lt;td&gt; &lt;/td&gt; &lt;td&gt; &lt;/td&gt; &lt;/tr&gt; &lt;tr align="left" valign="middle"&gt; &lt;td class="font_01"&gt; Unique Code:&amp;nbsp; &lt;/td&gt; &lt;td&gt; &lt;asp:TextBox runat="server" ID="txtCode"/&gt; &lt;/td&gt; &lt;td&gt; &amp;nbsp;&amp;nbsp; &lt;/td&gt; &lt;td class="font_01"&gt; File Name:&amp;nbsp; &lt;/td&gt; &lt;td &gt; &lt;asp:TextBox runat="server" ID="txtFileName"/&gt; &lt;/td&gt; &lt;td&gt; &lt;asp:Button ID="Button1" runat="server" CssClass="font_01" Text="Go" Width="50px" Height="20px" onclick="btnSearch_Click" /&gt; &lt;/td&gt; &lt;td&gt; &lt;!-- &lt;asp:Button ID="Button2" runat="server" CssClass="font_01" Text="List All" Width="50px" Height="20px" onclick="btnListAll_Click" /&gt;--&gt; &lt;/td&gt; &lt;/tr&gt; &lt;tr valign="middle"&gt; &lt;td&gt;&lt;/td&gt; &lt;td colspan="5" &gt; &lt;/td&gt; &lt;td&gt;&lt;/td&gt; &lt;/tr&gt; &lt;/table&gt; &lt;/asp:Panel&gt; &lt;asp:UpdatePanel ID="updatePnl" runat="server" &gt; &lt;ContentTemplate&gt; &lt;CR:CrystalReportViewer Width="500px" Height="400px" ID="CrystalReportViewer1" runat="server" AutoDataBind="true" /&gt; &lt;/ContentTemplate&gt; &lt;/asp:UpdatePanel&gt; </code></pre> <p>Do the change like this and remove the code for unload........</p>