title: How to check .net website version?
body: <p>i have a website source code in my pc
  i want to check in which framework it was developed any one guide me? (i.e 2.0,3.5,4.0)</p>
  
  <p>according to me it seems to be developed in 3.5 but i am not sure please confirm
  i have attached web.config file of it.</p>
  
  <pre><code>&lt;?xml version="1.0"?&gt;&lt;configuration&gt;
    &lt;configSections&gt;
      &lt;sectionGroup name="system.web.extensions" type="System.Web.Configuration.SystemWebExtensionsSectionGroup, System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35"&gt;
        &lt;sectionGroup name="scripting" type="System.Web.Configuration.ScriptingSectionGroup, System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35"&gt;
          &lt;section name="scriptResourceHandler" type="System.Web.Configuration.ScriptingScriptResourceHandlerSection, System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35" requirePermission="false" allowDefinition="MachineToApplication"/&gt;
          &lt;sectionGroup name="webServices" type="System.Web.Configuration.ScriptingWebServicesSectionGroup, System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35"&gt;
            &lt;section name="jsonSerialization" type="System.Web.Configuration.ScriptingJsonSerializationSection, System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35" requirePermission="false" allowDefinition="Everywhere"/&gt;
            &lt;section name="profileService" type="System.Web.Configuration.ScriptingProfileServiceSection, System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35" requirePermission="false" allowDefinition="MachineToApplication"/&gt;
            &lt;section name="authenticationService" type="System.Web.Configuration.ScriptingAuthenticationServiceSection, System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35" requirePermission="false" allowDefinition="MachineToApplication"/&gt;
            &lt;section name="roleService" type="System.Web.Configuration.ScriptingRoleServiceSection, System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35" requirePermission="false" allowDefinition="MachineToApplication"/&gt;
          &lt;/sectionGroup&gt;
        &lt;/sectionGroup&gt;
      &lt;/sectionGroup&gt;
        &lt;sectionGroup name="applicationSettings" type="System.Configuration.ApplicationSettingsGroup, System, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" &gt;
            &lt;section name="Responsive_PTS.Properties.Settings" type="System.Configuration.ClientSettingsSection, System, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" requirePermission="false" /&gt;
        &lt;/sectionGroup&gt;
    &lt;/configSections&gt;
    &lt;appSettings/&gt;
    &lt;connectionStrings&gt;
      &lt;add name="ResponsivePTSDB" connectionString="Provider=Microsoft.Jet.OLEDB.4.0;Data Source='|DataDirectory|database.mdb';Jet OLEDB:Database Password=pts;"/&gt;
    &lt;/connectionStrings&gt;
    &lt;system.web&gt;
      &lt;!-- 
              Set compilation debug="true" to insert debugging 
              symbols into the compiled page. Because this 
              affects performance, set this value to true only 
              during development.
          --&gt;
      &lt;compilation debug="true"&gt;
        &lt;assemblies&gt;
          &lt;add assembly="System.Core, Version=3.5.0.0, Culture=neutral, PublicKeyToken=B77A5C561934E089"/&gt;
          &lt;add assembly="System.Data.DataSetExtensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=B77A5C561934E089"/&gt;
          &lt;add assembly="System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35"/&gt;
          &lt;add assembly="System.Xml.Linq, Version=3.5.0.0, Culture=neutral, PublicKeyToken=B77A5C561934E089"/&gt;
  
                  &lt;add assembly="System.Design, Version=2.0.0.0, Culture=neutral, PublicKeyToken=B03F5F7F11D50A3A"/&gt;
                  &lt;add assembly="System.Windows.Forms, Version=2.0.0.0, Culture=neutral, PublicKeyToken=B77A5C561934E089"/&gt;&lt;/assemblies&gt;
      &lt;/compilation&gt;
      &lt;!--
              The &lt;authentication&gt; section enables configuration 
              of the security authentication mode used by 
              ASP.NET to identify an incoming user. 
          --&gt;
      &lt;authentication mode="Windows"/&gt;
      &lt;!--
              The &lt;customErrors&gt; section enables configuration 
              of what to do if/when an unhandled error occurs 
              during the execution of a request. Specifically, 
              it enables developers to configure html error pages 
              to be displayed in place of a error stack trace.
  
          &lt;customErrors mode="RemoteOnly" defaultRedirect="GenericErrorPage.htm"&gt;
              &lt;error statusCode="403" redirect="NoAccess.htm" /&gt;
              &lt;error statusCode="404" redirect="FileNotFound.htm" /&gt;
          &lt;/customErrors&gt;
          --&gt;
      &lt;pages maxPageStateFieldLength ="40"&gt;
        &lt;controls&gt;
          &lt;add tagPrefix="asp" namespace="System.Web.UI" assembly="System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35"/&gt;
          &lt;add tagPrefix="asp" namespace="System.Web.UI.WebControls" assembly="System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35"/&gt;
        &lt;/controls&gt;
      &lt;/pages&gt;
      &lt;httpHandlers&gt;
        &lt;remove verb="*" path="*.asmx"/&gt;
        &lt;add verb="*" path="*.asmx" validate="false" type="System.Web.Script.Services.ScriptHandlerFactory, System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35"/&gt;
        &lt;add verb="*" path="*_AppService.axd" validate="false" type="System.Web.Script.Services.ScriptHandlerFactory, System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35"/&gt;
        &lt;add verb="GET,HEAD" path="ScriptResource.axd" type="System.Web.Handlers.ScriptResourceHandler, System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35" validate="false"/&gt;
      &lt;/httpHandlers&gt;
      &lt;httpModules&gt;
        &lt;add name="ScriptModule" type="System.Web.Handlers.ScriptModule, System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35"/&gt;
      &lt;/httpModules&gt;
    &lt;/system.web&gt;
    &lt;system.codedom&gt;
      &lt;compilers&gt;
        &lt;compiler language="c#;cs;csharp" extension=".cs" warningLevel="4" type="Microsoft.CSharp.CSharpCodeProvider, System, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089"&gt;
          &lt;providerOption name="CompilerVersion" value="v3.5"/&gt;
          &lt;providerOption name="WarnAsError" value="false"/&gt;
        &lt;/compiler&gt;
      &lt;/compilers&gt;
    &lt;/system.codedom&gt;
    &lt;!-- 
          The system.webServer section is required for running ASP.NET AJAX under Internet
          Information Services 7.0.  It is not necessary for previous version of IIS.
      --&gt;
    &lt;system.webServer&gt;
      &lt;validation validateIntegratedModeConfiguration="false"/&gt;
      &lt;modules&gt;
        &lt;remove name="ScriptModule"/&gt;
        &lt;add name="ScriptModule" preCondition="managedHandler" type="System.Web.Handlers.ScriptModule, System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35"/&gt;
      &lt;/modules&gt;
      &lt;handlers&gt;
        &lt;remove name="WebServiceHandlerFactory-Integrated"/&gt;
        &lt;remove name="ScriptHandlerFactory"/&gt;
        &lt;remove name="ScriptHandlerFactoryAppServices"/&gt;
        &lt;remove name="ScriptResource"/&gt;
        &lt;add name="ScriptHandlerFactory" verb="*" path="*.asmx" preCondition="integratedMode" type="System.Web.Script.Services.ScriptHandlerFactory, System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35"/&gt;
        &lt;add name="ScriptHandlerFactoryAppServices" verb="*" path="*_AppService.axd" preCondition="integratedMode" type="System.Web.Script.Services.ScriptHandlerFactory, System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35"/&gt;
        &lt;add name="ScriptResource" preCondition="integratedMode" verb="GET,HEAD" path="ScriptResource.axd" type="System.Web.Handlers.ScriptResourceHandler, System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35"/&gt;
      &lt;/handlers&gt;
    &lt;/system.webServer&gt;
    &lt;runtime&gt;
      &lt;assemblyBinding xmlns="urn:schemas-microsoft-com:asm.v1"&gt;
        &lt;dependentAssembly&gt;
          &lt;assemblyIdentity name="System.Web.Extensions" publicKeyToken="31bf3856ad364e35"/&gt;
          &lt;bindingRedirect oldVersion="1.0.0.0-1.1.0.0" newVersion="3.5.0.0"/&gt;
        &lt;/dependentAssembly&gt;
        &lt;dependentAssembly&gt;
          &lt;assemblyIdentity name="System.Web.Extensions.Design" publicKeyToken="31bf3856ad364e35"/&gt;
          &lt;bindingRedirect oldVersion="1.0.0.0-1.1.0.0" newVersion="3.5.0.0"/&gt;
        &lt;/dependentAssembly&gt;
      &lt;/assemblyBinding&gt;
    &lt;/runtime&gt;
                           &lt;applicationSettings&gt;
                               &lt;Responsive_PTS.Properties.Settings&gt;
                                   &lt;setting name="Responsive_PTS_GlobalTransport_GlobalPayments"
                                       serializeAs="String"&gt;
                                       &lt;value&gt;https://certapia.globalpay.com/GlobalPay/transact.asmx&lt;/value&gt;
                                   &lt;/setting&gt;
                               &lt;/Responsive_PTS.Properties.Settings&gt;
                           &lt;/applicationSettings&gt;
  &lt;/configuration&gt;
  </code></pre>
  
  <p>Thanks in advance.</p>