runat=server on the button
<asp:LinkButton ID="LinkButton1" runat="server" Font-Bold="False" Font-Names="Verdana" Font-Size="7pt" PostBackUrl="~/BFFileDetails.aspx">VIEW FILE</asp:LinkButton></td>
And my web.config file does not have the http handler 'clear'. I'm not sure if there is a configuration problem on the web server? I have pasted my web.config below.
<?xml version="1.0"?>
<configuration xmlns="http://schemas.microsoft.com/.NetConfiguration/v2.0">
<connectionStrings>
<add name="PilotAConnectionString" connectionString="Data Source=AX7WEBDEV;Initial Catalog=PilotA;Integrated Security=True" providerName="System.Data.SqlClient"/>
</connectionStrings>
<system.web>
<pages styleSheetTheme="White"/>
<customErrors mode="Off"/>
<compilation debug="false">
<assemblies>
<add assembly="eWorld.UI, Version=1.9.0.0, Culture=neutral, PublicKeyToken=24D65337282035F2"/>
<add assembly="CrystalDecisions.Web, Version=10.2.3600.0, Culture=neutral, PublicKeyToken=692FBEA5521E1304"/><add assembly="CrystalDecisions.CrystalReports.Engine, Version=10.2.3600.0, Culture=neutral, PublicKeyToken=692fbea5521e1304"/><add assembly="CrystalDecisions.ReportSource, Version=10.2.3600.0, Culture=neutral, PublicKeyToken=692fbea5521e1304"/><add assembly="CrystalDecisions.Shared, Version=10.2.3600.0, Culture=neutral, PublicKeyToken=692fbea5521e1304"/><add assembly="CrystalDecisions.ReportAppServer.ClientDoc, Version=10.2.3600.0, Culture=neutral, PublicKeyToken=692fbea5521e1304"/><add assembly="CrystalDecisions.Enterprise.Framework, Version=10.2.3600.0, Culture=neutral, PublicKeyToken=692fbea5521e1304"/><add assembly="CrystalDecisions.Enterprise.InfoStore, Version=10.2.3600.0, Culture=neutral, PublicKeyToken=692fbea5521e1304"/></assemblies></compilation>
<authentication mode="Windows"/>
<identity impersonate="True"/>
<globalization requestEncoding="utf-8" responseEncoding="utf-8"/>
<siteMap defaultProvider="XmlSiteMapProvider" enabled="true">
<providers>
<add name="XmlSiteMapProvider" description="SiteMap provider which reads in .sitemap XML files." type="System.Web.XmlSiteMapProvider, System.Web, Version=2.0.3600.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a" siteMapFile="web.sitemap" securityTrimmingEnabled="true"/>
</providers>
</siteMap>
<httpHandlers><add verb="GET" path="CrystalImageHandler.aspx" type="CrystalDecisions.Web.CrystalImageHandler, CrystalDecisions.Web, Version=10.2.3600.0, Culture=neutral, PublicKeyToken=692fbea5521e1304"/></httpHandlers></system.web>
</configuration>